diff --git a/.traceroute.yml b/.traceroute.yml
index c42e9f7626b..cf45b1e703c 100644
--- a/.traceroute.yml
+++ b/.traceroute.yml
@@ -16,6 +16,7 @@ ignore_unreachable_actions:
   - .*#require_staff_login
   - .*#require_admin_login
   - .*#require_mentor_login
+  - .*#require_admin_or_mentor_login
   - mails#welcome
   - reports#convert_to_hour_minute
   - reports#convert_to_ceiled_hour
diff --git a/Gemfile b/Gemfile
index 609895f6fc9..acb77ce2b94 100644
--- a/Gemfile
+++ b/Gemfile
@@ -44,7 +44,6 @@ gem 'rails_autolink'
 gem 'rails-i18n'
 gem 'ransack'
 gem 'rollbar'
-gem 'rqrcode'
 gem 'slim-rails'
 gem 'sorcery'
 gem 'sorcery-jwt'
diff --git a/Gemfile.lock b/Gemfile.lock
index 6aedbdfb6ba..ccc68c456e0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,7 +107,6 @@ GEM
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
     childprocess (3.0.0)
-    chunky_png (1.4.0)
     cocoon (1.2.15)
     coderay (1.1.3)
     coffee-rails (5.0.0)
@@ -345,10 +344,6 @@ GEM
     retriable (3.1.2)
     rexml (3.2.5)
     rollbar (3.1.1)
-    rqrcode (1.2.0)
-      chunky_png (~> 1.0)
-      rqrcode_core (~> 0.2)
-    rqrcode_core (0.2.0)
     rubocop (1.18.3)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
@@ -531,7 +526,6 @@ DEPENDENCIES
   rails_autolink
   ransack
   rollbar
-  rqrcode
   rubocop
   rubocop-fjord
   rubocop-minitest
diff --git a/app/assets/images/pijord-book-logo.svg b/app/assets/images/pijord-book-logo.svg
deleted file mode 100644
index 4ecf5b9a6b3..00000000000
--- a/app/assets/images/pijord-book-logo.svg
+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file
diff --git a/app/assets/stylesheets/atoms/_a-meta.sass b/app/assets/stylesheets/atoms/_a-meta.sass
index 1bb7e79d5c5..e2f26099a42 100644
--- a/app/assets/stylesheets/atoms/_a-meta.sass
+++ b/app/assets/stylesheets/atoms/_a-meta.sass
@@ -30,7 +30,7 @@ a.a-meta
   color: $muted-text
   transition: all .2s ease-out
   &:hover
-    color: $main
+    color: $main-text
   &.is-disabled
     pointer-events: none
 
diff --git a/app/assets/stylesheets/atoms/_a-user-name.sass b/app/assets/stylesheets/atoms/_a-user-name.sass
index dbcdb8a8316..2e9fc209110 100644
--- a/app/assets/stylesheets/atoms/_a-user-name.sass
+++ b/app/assets/stylesheets/atoms/_a-user-name.sass
@@ -2,6 +2,7 @@
   color: $muted-text
   font-size: .8125rem
   line-height: 1.4
+  white-space: nowrap
 
 a.a-user-name
   +hover-link
diff --git a/app/assets/stylesheets/blocks/admin/_admin-table.sass b/app/assets/stylesheets/blocks/admin/_admin-table.sass
index 2dc4f6b3581..06e04393374 100644
--- a/app/assets/stylesheets/blocks/admin/_admin-table.sass
+++ b/app/assets/stylesheets/blocks/admin/_admin-table.sass
@@ -93,7 +93,7 @@
     text-decoration: underline
 
 .admin-table__user-login-name
-  color: $main
+  color: $main-text
 
 .is-user-icon-xl
   +size(100% auto)
diff --git a/app/assets/stylesheets/blocks/calender/_calender-header.sass b/app/assets/stylesheets/blocks/calender/_calender-header.sass
deleted file mode 100644
index 95d5c812864..00000000000
--- a/app/assets/stylesheets/blocks/calender/_calender-header.sass
+++ /dev/null
@@ -1,11 +0,0 @@
-.calender-header
-  margin-bottom: 1rem
-
-.calender-header__inner
-  display: flex
-  justify-content: center
-  align-items: center
-
-.calender-header__title
-  font-size: 1.25rem
-  +margin(horizontal, 1rem)
diff --git a/app/assets/stylesheets/blocks/card/_card-books.sass b/app/assets/stylesheets/blocks/card/_card-books.sass
index b0b5f21c5a1..7b3a5b38bd4 100644
--- a/app/assets/stylesheets/blocks/card/_card-books.sass
+++ b/app/assets/stylesheets/blocks/card/_card-books.sass
@@ -1,5 +1,13 @@
+.card-books__items
+  +media-breakpoint-up(md)
+    display: flex
+    flex-wrap: wrap
 
 .card-books-item
+  +media-breakpoint-up(md)
+    flex: 0 0 50%
+    &:nth-child(odd)
+      border-right: solid 1px $border
   &:not(:first-child)
     border-top: solid 1px $border
 
@@ -39,7 +47,7 @@
 
 .card-books-item__inner:hover .card-books-item__title-label
   text-decoration: underline
-  color: $main
+  color: $main-text
 
 .card-books-item__price
   +text-block(.875rem 1.4 .5em, $default-text)
diff --git a/app/assets/stylesheets/blocks/course/_courses.sass b/app/assets/stylesheets/blocks/course/_courses.sass
index 3e532e4a893..f82a26b7964 100644
--- a/app/assets/stylesheets/blocks/course/_courses.sass
+++ b/app/assets/stylesheets/blocks/course/_courses.sass
@@ -13,7 +13,7 @@
 
 .courses-item__title-link
   display: block
-  color: $main
+  color: $main-text
   +hover-link
 
 .courses-item__description
diff --git a/app/assets/stylesheets/blocks/form/_form-actions.sass b/app/assets/stylesheets/blocks/form/_form-actions.sass
index afac5a11898..7a4e82541d4 100644
--- a/app/assets/stylesheets/blocks/form/_form-actions.sass
+++ b/app/assets/stylesheets/blocks/form/_form-actions.sass
@@ -34,7 +34,7 @@
       margin-bottom: 1rem
   &.is-main
     +media-breakpoint-up(md)
-      min-width: 16rem
+      min-width: 20rem
     +media-breakpoint-down(sm)
       width: 100%
   &.has-help
diff --git a/app/assets/stylesheets/blocks/form/_many-check-boxes.sass b/app/assets/stylesheets/blocks/form/_many-check-boxes.sass
index b16c638c414..8f2f89a8afd 100644
--- a/app/assets/stylesheets/blocks/form/_many-check-boxes.sass
+++ b/app/assets/stylesheets/blocks/form/_many-check-boxes.sass
@@ -12,7 +12,7 @@
   cursor: pointer
   &.is-checked
     background-color: $accent
-    color: $main
+    color: $main-text
   .many-check-boxes__item:last-child &
     border-bottom: none
   input
diff --git a/app/assets/stylesheets/blocks/form/_reservations.sass b/app/assets/stylesheets/blocks/form/_reservations.sass
deleted file mode 100644
index 775e3c09b8e..00000000000
--- a/app/assets/stylesheets/blocks/form/_reservations.sass
+++ /dev/null
@@ -1,86 +0,0 @@
-=calender-size
-  &.is-day
-    flex-basis: 4.5rem
-    width: 4.5rem
-    min-width: 4.5rem
-    max-width: 4.5rem
-  &.is-seat
-    flex-basis: 5rem
-    width: 5rem
-    min-width: 5rem
-    max-width: 5rem
-  &.is-memo
-    flex: 100
-    +media-breakpoint-down(sm)
-      min-width: 15rem
-
-.reservations__outer
-  overflow-x: auto
-  background-color: $base
-
-.reservations__calender
-  min-width: 100%
-  table-layout: fixed
-  background-color: $base
-
-.reservations__calender-header
-  background-color: #eceeef
-  display: flex
-
-.reservations__calender-header-label
-  padding: .25rem
-  background-color: #eceeef
-  border: solid 1px $border-shade
-  +text-block(.75rem, nowrap flex)
-  align-items: center
-  justify-content: center
-  +calender-size
-  &:not(:last-child)
-    border-right: none
-
-.reservations__day-item
-  display: flex
-  &.is-holiday
-    background-color: tint($danger, 98%)
-  .reservations__day-item-value
-    border: solid 1px $border-shade
-    +calender-size
-    border-top: none
-    display: flex
-    align-items: center
-    justify-content: center
-    &:not(:last-child)
-      border-right: none
-    &.is-memo
-      justify-content: flex-start
-      padding: .375rem
-      +text-block(.75rem 1.2)
-      +position(relative)
-  &:hover
-    background-color: tint($warning, 94%)
-
-.reservation
-  +size(100%)
-
-.reservations__seat-action
-  +size(100%)
-  min-height: 2rem
-  +padding(horizontal, .375rem)
-  cursor: pointer
-  +text-block(.75rem 1.1, flex)
-  align-items: center
-  justify-content: center
-  word-break: break-all
-  &:hover
-    box-shadow: inset rgba($primary, .5) 0 0 0 1px
-  &.is-reserved.is-not-me
-    background-color: rgba(black, .05)
-  &.is-reserved.is-me
-    background-color: $danger
-    color: $reversal-text
-
-.reservations__day
-  +text-block(.75rem, right nowrap)
-  +padding(horizontal, .5rem)
-  .reservations__day-item.is-holiday &
-    color: $danger
diff --git a/app/assets/stylesheets/blocks/header/_header-dropdown.sass b/app/assets/stylesheets/blocks/header/_header-dropdown.sass
index 18024ea74fa..9fed3dc5956 100644
--- a/app/assets/stylesheets/blocks/header/_header-dropdown.sass
+++ b/app/assets/stylesheets/blocks/header/_header-dropdown.sass
@@ -87,7 +87,7 @@
   +size(100% 2.75rem)
   transition: all .2s ease-out
   +media-breakpoint-up(md)
-    color: $main
+    color: $main-text
   +media-breakpoint-down(sm)
     color: $reversal-text
   &:hover
diff --git a/app/assets/stylesheets/blocks/header/_header-links.sass b/app/assets/stylesheets/blocks/header/_header-links.sass
index ca4fe287b0a..8f11801e2af 100644
--- a/app/assets/stylesheets/blocks/header/_header-links.sass
+++ b/app/assets/stylesheets/blocks/header/_header-links.sass
@@ -34,7 +34,7 @@
     background-color: #f8f8f8
   &.is-active
     background-color: $warning
-    color: $main
+    color: $main-text
 
 .header-links__link-label
   margin-top: .375em
diff --git a/app/assets/stylesheets/blocks/page/_page-tabs.sass b/app/assets/stylesheets/blocks/page/_page-tabs.sass
index 66b9e4cbe66..974811ea124 100644
--- a/app/assets/stylesheets/blocks/page/_page-tabs.sass
+++ b/app/assets/stylesheets/blocks/page/_page-tabs.sass
@@ -2,7 +2,7 @@
   background-color: $background-shade
   padding-top: .5rem
   border-top: solid 1px $border-shade
-  border-bottom: solid 1px $border-more-shade
+  border-bottom: solid 1px $border-more-more-shade
   .sort-nav + &
     border-top: solid 1px $border-more-more-shade
   +media-breakpoint-down(sm)
@@ -31,24 +31,28 @@
 
 .page-tabs__item-link
   +flex-link
-  +text-block(.825rem 1, #7d8486 600)
+  +text-block(.825rem 1, $default-text 600)
   align-items: center
   justify-content: center
   height: 2.75rem
   background-color: #dedede
   +padding(horizontal, 1em)
   +border-radius(top, .25rem)
-  border: solid 1px $border-more-shade
+  border: solid 1px $border-more-more-shade
   +position(relative)
+  transition: all .2s ease-out
   +media-breakpoint-down(sm)
     font-size: .75rem
   &:hover
-    color: $default-text
+    background-color: $background
   &.is-active
     background-color: $background
-    border-color: $border-more-shade
+    border-color: $border-more-more-shade
     border-bottom-color: $background
-    color: $default-text
+    color: $main-text
+  &.is-inactive
+    pointer-events: none
+    color: $muted-text
 
 .page-tabs__item-count
   +position(right .125rem, top .125rem)
diff --git a/app/assets/stylesheets/blocks/page/_switch.sass b/app/assets/stylesheets/blocks/page/_switch.sass
index 87366fc6b9c..888abf1c1a8 100644
--- a/app/assets/stylesheets/blocks/page/_switch.sass
+++ b/app/assets/stylesheets/blocks/page/_switch.sass
@@ -15,7 +15,7 @@
       +position(relative, top -1px)
     &:hover
       .switch__label-text
-        color: $main
+        color: $main-text
         text-decoration: underline
       .a-help
         background-color: $main
diff --git a/app/assets/stylesheets/blocks/practice/_categories.sass b/app/assets/stylesheets/blocks/practice/_categories.sass
index 9e02752c990..36daa26a374 100644
--- a/app/assets/stylesheets/blocks/practice/_categories.sass
+++ b/app/assets/stylesheets/blocks/practice/_categories.sass
@@ -49,7 +49,7 @@
   +text-block(1rem 1, $muted-text)
   transition: all .2s ease-out
   &:hover
-    color: $main
+    color: $main-text
 
 .categories__label
   +text-block(.75rem 2rem, $main center 600)
@@ -94,4 +94,4 @@
   +text-block(1rem 1, $muted-text)
   transition: all .2s ease-out
   &:hover
-    color: $main
+    color: $main-text
diff --git a/app/assets/stylesheets/blocks/practice/_practice-contents.sass b/app/assets/stylesheets/blocks/practice/_practice-contents.sass
index 9006dd8e0b0..2dbf082c2c3 100644
--- a/app/assets/stylesheets/blocks/practice/_practice-contents.sass
+++ b/app/assets/stylesheets/blocks/practice/_practice-contents.sass
@@ -39,6 +39,6 @@
     transition: all .2s ease-out
   &:hover
     .a-meta
-      color: $main
+      color: $main-text
     .a-help
       background-color: $main
diff --git a/app/assets/stylesheets/blocks/shared/_page-nav.sass b/app/assets/stylesheets/blocks/shared/_page-nav.sass
index 8c4dd689440..f86df964806 100644
--- a/app/assets/stylesheets/blocks/shared/_page-nav.sass
+++ b/app/assets/stylesheets/blocks/shared/_page-nav.sass
@@ -1,7 +1,7 @@
 .page-nav
   +position(right 0, top 3.5rem)
   flex: 1
-  min-width: 14rem
+  min-width: 20rem
   position: sticky
   background-color: $base
   border: solid 1px #dadada
@@ -36,15 +36,15 @@
     border-bottom: none
 
 .page-nav__item-link
-  padding: .375rem .75rem
-  +text-block(.75rem 1.4, block $muted-text)
+  padding: .5rem .75rem
+  +text-block(.8125rem 1.4, block $muted-text)
   +block-link
   transition: all .1s ease-in
   background-color: transparent
   .page-nav__item:last-child &
     +border-radius(bottom, .25rem)
   &:hover
-    color: $main
+    color: $main-text
     text-decoration: underline
   &.is-current
     pointer-events: none
diff --git a/app/assets/stylesheets/blocks/shared/_page-tags-nav.sass b/app/assets/stylesheets/blocks/shared/_page-tags-nav.sass
index c19f23fc4cb..6bd6516e5ef 100644
--- a/app/assets/stylesheets/blocks/shared/_page-tags-nav.sass
+++ b/app/assets/stylesheets/blocks/shared/_page-tags-nav.sass
@@ -5,7 +5,7 @@
   +media-breakpoint-up(md)
     +position(sticky, right 0, top 3.5rem)
     flex: 1
-    min-width: 16rem
+    min-width: 20rem
     margin-left: 1.5rem
   +media-breakpoint-down(sm)
     margin-top: 1rem
diff --git a/app/assets/stylesheets/blocks/shared/_tab-nav.sass b/app/assets/stylesheets/blocks/shared/_tab-nav.sass
index 177af63ef68..77ddfa29a86 100644
--- a/app/assets/stylesheets/blocks/shared/_tab-nav.sass
+++ b/app/assets/stylesheets/blocks/shared/_tab-nav.sass
@@ -1,5 +1,11 @@
 .tab-nav
   border-bottom: solid 1px $background-shade
+  &.is-centered
+    border-bottom: none
+    .tab-nav__items
+      justify-content: center
+      padding-top: 1.5rem
+      padding-bottom: 0
   &:not(:last-child)
     margin-bottom: 1.5rem
 
@@ -26,7 +32,7 @@
   transition: all.2s ease-out
   &:hover
     background-color: shade($background-shade, 10%)
-    color: $main
+    color: $main-text
   &.is-active
     background-color: $accent
-    color: $main
+    color: $main-text
diff --git a/app/assets/stylesheets/blocks/thread/_thread-comments.sass b/app/assets/stylesheets/blocks/thread/_thread-comments.sass
index cd92b353376..87a8a89a5e4 100644
--- a/app/assets/stylesheets/blocks/thread/_thread-comments.sass
+++ b/app/assets/stylesheets/blocks/thread/_thread-comments.sass
@@ -34,7 +34,7 @@ $thread-header-author: 3.5rem
     margin-right: 0
 
 .thread-comment__title-link
-  color: $main
+  color: $main-text
   height: 100%
   display: flex
   align-items: center
diff --git a/app/assets/stylesheets/blocks/thread/_thread-list-item-actions.sass b/app/assets/stylesheets/blocks/thread/_thread-list-item-actions.sass
index 7eb9af170f0..886609e4acd 100644
--- a/app/assets/stylesheets/blocks/thread/_thread-list-item-actions.sass
+++ b/app/assets/stylesheets/blocks/thread/_thread-list-item-actions.sass
@@ -38,4 +38,4 @@
     margin-right: .5em
   &:hover
     background-color: tint($main, 95%)
-    color: $main
+    color: $main-text
diff --git a/app/assets/stylesheets/blocks/thread/_thread-list-item-meta.sass b/app/assets/stylesheets/blocks/thread/_thread-list-item-meta.sass
index 3b4499dbbee..76a9801e955 100644
--- a/app/assets/stylesheets/blocks/thread/_thread-list-item-meta.sass
+++ b/app/assets/stylesheets/blocks/thread/_thread-list-item-meta.sass
@@ -22,7 +22,7 @@
     +margin(horizontal, .125em)
 .thread-list-item-meta__item-link
   +hover-link-reversal
-  color: $main
+  color: $main-text
 
 .thread-list-item-meta__item-note
   +text-block(.75rem 1.4, $default-text)
diff --git a/app/assets/stylesheets/blocks/thread/_thread-list-item-tags-edit.sass b/app/assets/stylesheets/blocks/thread/_thread-list-item-tags-edit.sass
index f2cd059a4bf..71f67c8784d 100644
--- a/app/assets/stylesheets/blocks/thread/_thread-list-item-tags-edit.sass
+++ b/app/assets/stylesheets/blocks/thread/_thread-list-item-tags-edit.sass
@@ -4,7 +4,7 @@
 .thread-list-item-tags__item-edit
   +hover-link-reversal
   cursor: pointer
-  color: $main
+  color: $main-text
 
 .thread-list-item-tags-edit__actions
   margin-top: .5rem
diff --git a/app/assets/stylesheets/blocks/thread/_thread-list-item.sass b/app/assets/stylesheets/blocks/thread/_thread-list-item.sass
index fe731624ded..3ea3f3825de 100644
--- a/app/assets/stylesheets/blocks/thread/_thread-list-item.sass
+++ b/app/assets/stylesheets/blocks/thread/_thread-list-item.sass
@@ -37,19 +37,15 @@
     color: $reversal-text
     border-color: #b50f38
 
-
 .thread-list-item__inner
   +position(relative)
   padding-left: 3.75rem
   +media-breakpoint-down(sm)
     padding-left: 3rem
-  .thread-list-item.has-assigned &
-    +media-breakpoint-up(md)
-      padding-right: 8.75rem
 
 .thread-list-item__assignee
   +media-breakpoint-up(md)
-    +position(absolute, right 0, top 0)
+    +position(absolute, right -.5rem, top -.25rem)
     width: 8rem
   +media-breakpoint-down(sm)
     margin-top: .75rem
@@ -118,14 +114,19 @@
     opacity: .6
 
 .thread-list-item__row-separator
-  // TODO resetに移す
-  border: none
-  margin-bottom: .25rem
   border-top: dashed 1px $border
+  height: 1px
+  +media-breakpoint-up(md)
+    +margin(vertical, .5rem)
+  +media-breakpoint-down(sm)
+    +margin(vertical, .75rem .25rem)
 
 .thread-list-item__row
   &:not(:first-child)
     margin-top: .25rem
+  .thread-list-item.has-assigned &:first-child
+    +media-breakpoint-up(md)
+      padding-right: 8.5rem
 
 .thread-list-item__show-user-detail
   +position(absolute, top 0)
diff --git a/app/assets/stylesheets/blocks/thread/_thread-questions.sass b/app/assets/stylesheets/blocks/thread/_thread-questions.sass
index d5f4f0e7269..10b9842785f 100644
--- a/app/assets/stylesheets/blocks/thread/_thread-questions.sass
+++ b/app/assets/stylesheets/blocks/thread/_thread-questions.sass
@@ -33,7 +33,7 @@ $thread-header-author: 3.5rem
     font-size: .9375rem
 
 .thread-question__title-link
-  color: $main
+  color: $main-text
   height: 100%
   display: flex
   align-items: center
diff --git a/app/assets/stylesheets/blocks/thread/_thread-watch.sass b/app/assets/stylesheets/blocks/thread/_thread-watch.sass
index d729045d6d2..6d74af76903 100644
--- a/app/assets/stylesheets/blocks/thread/_thread-watch.sass
+++ b/app/assets/stylesheets/blocks/thread/_thread-watch.sass
@@ -3,8 +3,8 @@
     height: 1.375rem
     width: 5.5rem
   &.is-active
-    color: $main
+    color: $main-text
     border-color: $main
     &:hover
-      color: $main
+      color: $main-text
       border-color: $main
diff --git a/app/assets/stylesheets/blocks/user/_completed-practices-progress.sass b/app/assets/stylesheets/blocks/user/_completed-practices-progress.sass
index 8087a39843e..d562f597b71 100644
--- a/app/assets/stylesheets/blocks/user/_completed-practices-progress.sass
+++ b/app/assets/stylesheets/blocks/user/_completed-practices-progress.sass
@@ -23,6 +23,6 @@ $bar-height: .75rem
   +position(relative, top $bar-height * -1)
   box-shadow: rgba(black, .2) 0 .0625rem .0625rem
 
-.completed-practices-progress__percentage-number
+.completed-practices-progress__number
   +text-block(.875rem 1rem, right)
   +size(2.5rem 1rem)
diff --git a/app/assets/stylesheets/blocks/user/_niconico-calendar.sass b/app/assets/stylesheets/blocks/user/_niconico-calendar.sass
index 2429167d1ba..40d2650d1c1 100644
--- a/app/assets/stylesheets/blocks/user/_niconico-calendar.sass
+++ b/app/assets/stylesheets/blocks/user/_niconico-calendar.sass
@@ -14,7 +14,7 @@
   +hover-link
   transition: all .2s ease-out
   &:hover
-    color: $main
+    color: $main-text
   &.is-blank
     cursor: default
     pointer-events: none
@@ -40,7 +40,7 @@
   &.is-sunday
     color: $danger
   &.is-saturday
-    color: $main
+    color: $main-text
 
 .niconico-calendar__day
   &.is-blank
diff --git a/app/assets/stylesheets/blocks/user/_sns-links.sass b/app/assets/stylesheets/blocks/user/_sns-links.sass
index 22f23e5c947..a5456a913ae 100644
--- a/app/assets/stylesheets/blocks/user/_sns-links.sass
+++ b/app/assets/stylesheets/blocks/user/_sns-links.sass
@@ -4,4 +4,4 @@
 .sns-links__item-link
   font-size: .875rem
   &:hover
-    color: $main
+    color: $main-text
diff --git a/app/assets/stylesheets/blocks/user/_user-group.sass b/app/assets/stylesheets/blocks/user/_user-group.sass
index e0d11524614..b8d264026a6 100644
--- a/app/assets/stylesheets/blocks/user/_user-group.sass
+++ b/app/assets/stylesheets/blocks/user/_user-group.sass
@@ -11,7 +11,7 @@
 
 .user-group__title-link
   text-decoration: none
-  color: $main
+  color: $main-text
   +media-breakpoint-up(md)
     display: flex
     align-items: flex-end
diff --git a/app/assets/stylesheets/blocks/user/_users-item.sass b/app/assets/stylesheets/blocks/user/_users-item.sass
index 590739cb5f2..03b20154999 100644
--- a/app/assets/stylesheets/blocks/user/_users-item.sass
+++ b/app/assets/stylesheets/blocks/user/_users-item.sass
@@ -36,7 +36,7 @@
     font-size: .75em
 
 .users-item__name-link
-  color: $main
+  color: $main-text
   display: block
   +hover-link
 
diff --git a/app/assets/stylesheets/mixins/_long-text-style.sass b/app/assets/stylesheets/mixins/_long-text-style.sass
index fbe1ef1141f..8ce0f1f6f8b 100644
--- a/app/assets/stylesheets/mixins/_long-text-style.sass
+++ b/app/assets/stylesheets/mixins/_long-text-style.sass
@@ -61,6 +61,7 @@
     word-break: break-all
   a
     +hover-link-reversal
+    +default-link
     &:hover
       img
         border-color: mix($font, $background, 16%)
diff --git a/app/assets/stylesheets/qrcodes.sass b/app/assets/stylesheets/qrcodes.sass
deleted file mode 100644
index 8ceda5d9c8f..00000000000
--- a/app/assets/stylesheets/qrcodes.sass
+++ /dev/null
@@ -1,67 +0,0 @@
-html
-  font-size: 100%
-  line-height: 1
-  color: black
-
-body
-  margin: 0
-  padding: 16px
-  font-family: 'Hiragino Kaku Gothic Pro W3','Hiragino Kaku Gothic ProN',Meiryo,sans-serif
-
-*
-  box-sizing: border-box
-
-.sheet
-  display: block
-  break-after: page
-
-.book-stickers
-  display: flex
-  flex-wrap: wrap
-  align-content: flex-start
-
-.book-sticker
-  border: 1px solid #ccc
-  font-size: 12px
-  flex-basis: 220px
-  width: 220px
-  max-width: 220px
-  min-width: 220px
-  padding: 12px 10px
-  text-align: center
-  margin-right: -1px
-  margin-bottom: -1px
-
-.book-sticker__inner
-  display: flex
-  align-items: center
-  margin: 8px 0
-
-.book-sticker__logo
-  padding: 0 8px
-
-.book-sticker__logo-image
-  width: 100%
-
-.book-sticker__qrcode
-  flex: 1
-  padding: 0 16px 0 0
-
-.book-sticker__id
-  flex: 2
-
-.book-sticker__id-label
-  font-size: 10px
-  font-weight: bold
-  margin-bottom: 3px
-
-.book-sticker__id-body
-  text-align: center
-  border: 1px solid black
-  padding: 3px
-  border-radius: 2px
-
-.book-sticker__text
-  font-size: 10px
-  line-height: 1.4
-  text-align: left
diff --git a/app/assets/stylesheets/variables/_colors.sass b/app/assets/stylesheets/variables/_colors.sass
index 79d961cbb09..1881f065ec1 100644
--- a/app/assets/stylesheets/variables/_colors.sass
+++ b/app/assets/stylesheets/variables/_colors.sass
@@ -11,6 +11,7 @@ $reversal-text: white
 $muted-text: #9da4a7
 $semi-muted-text: #898998
 $placeholder-text: #bbbbbb
+$main-text: #3c3282
 
 $side: $main
 $side-border: #6b4eca
@@ -53,9 +54,9 @@ $input-border: #c1c5b9
 
 =default-link
   transition: color .2s ease-in
-  color: #4834ce
+  color: #4e3fad
   &:link
-    color: #4834ce
+    color: #4e3fad
   &:visited
     color: #6f78b7
   &:hover
diff --git a/app/controllers/admin/books/qrcodes_controller.rb b/app/controllers/admin/books/qrcodes_controller.rb
deleted file mode 100644
index 467ca2a9c86..00000000000
--- a/app/controllers/admin/books/qrcodes_controller.rb
+++ /dev/null
@@ -1,14 +0,0 @@
-# frozen_string_literal: true
-
-class Admin::Books::QrcodesController < AdminController
-  layout 'qrcodes'
-  DESPLAY_NUM = 12
-
-  def index
-    @books = Book.all
-  end
-
-  def show
-    @book = Book.find(params[:id])
-  end
-end
diff --git a/app/controllers/admin/books_controller.rb b/app/controllers/admin/books_controller.rb
deleted file mode 100644
index 279940af58c..00000000000
--- a/app/controllers/admin/books_controller.rb
+++ /dev/null
@@ -1,54 +0,0 @@
-# frozen_string_literal: true
-
-class Admin::BooksController < AdminController
-  before_action :set_book, only: %i[show edit update destroy]
-
-  def index
-    @books = Book.order(:title).page(params[:page])
-  end
-
-  def show; end
-
-  def new
-    @book = Book.new
-  end
-
-  def edit; end
-
-  def create
-    @book = Book.new(book_params)
-
-    if @book.save
-      redirect_to admin_books_url, notice: '書籍を登録しました。'
-    else
-      render action: 'new'
-    end
-  end
-
-  def update
-    if @book.update(book_params)
-      redirect_to admin_books_url, notice: '書籍を更新しました。'
-    else
-      render action: 'edit'
-    end
-  end
-
-  def destroy
-    @book.destroy
-    redirect_to admin_books_url, notice: '書籍を削除しました。'
-  end
-
-  private
-
-  def set_book
-    @book = Book.find(params[:id])
-  end
-
-  def book_params
-    params.require(:book).permit(
-      :title,
-      :isbn,
-      :borrowed
-    )
-  end
-end
diff --git a/app/controllers/admin/seats_controller.rb b/app/controllers/admin/seats_controller.rb
deleted file mode 100644
index 67eb745a913..00000000000
--- a/app/controllers/admin/seats_controller.rb
+++ /dev/null
@@ -1,48 +0,0 @@
-# frozen_string_literal: true
-
-class Admin::SeatsController < AdminController
-  before_action :set_seat, only: %i[edit update destroy]
-
-  def index
-    @seats = Seat.all
-  end
-
-  def new
-    @seat = Seat.new
-  end
-
-  def edit; end
-
-  def create
-    @seat = Seat.new(seat_params)
-
-    if @seat.save
-      redirect_to admin_seats_path, notice: '席を作成しました。'
-    else
-      render :new
-    end
-  end
-
-  def update
-    if @seat.update(seat_params)
-      redirect_to admin_seats_path, notice: '席を更新しました。'
-    else
-      render :edit
-    end
-  end
-
-  def destroy
-    @seat.destroy
-    redirect_to admin_seats_path, notice: '席を削除しました。'
-  end
-
-  private
-
-  def set_seat
-    @seat = Seat.find(params[:id])
-  end
-
-  def seat_params
-    params.require(:seat).permit(:name)
-  end
-end
diff --git a/app/controllers/api/events_controller.rb b/app/controllers/api/events_controller.rb
new file mode 100644
index 00000000000..e77809c7c40
--- /dev/null
+++ b/app/controllers/api/events_controller.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class API::EventsController < API::BaseController
+  before_action :require_login
+
+  def index
+    @events = Event.with_avatar
+                   .includes(:comments, :users)
+                   .order(created_at: :desc)
+                   .page(params[:page])
+  end
+end
diff --git a/app/controllers/api/notifications/unread_controller.rb b/app/controllers/api/notifications/unread_controller.rb
deleted file mode 100644
index 35bed44a747..00000000000
--- a/app/controllers/api/notifications/unread_controller.rb
+++ /dev/null
@@ -1,15 +0,0 @@
-# frozen_string_literal: true
-
-class API::Notifications::UnreadController < API::BaseController
-  def index
-    @notifications = if params[:page]
-                       current_user.notifications
-                                   .unreads_with_avatar
-                                   .order(created_at: :desc)
-                                   .page(params[:page])
-                     else
-                       current_user.notifications.unreads_with_avatar
-                     end
-    render template: 'api/notifications/index'
-  end
-end
diff --git a/app/controllers/api/notifications_controller.rb b/app/controllers/api/notifications_controller.rb
index 8c808af322c..4472b2a0cf9 100644
--- a/app/controllers/api/notifications_controller.rb
+++ b/app/controllers/api/notifications_controller.rb
@@ -2,8 +2,12 @@
 
 class API::NotificationsController < API::BaseController
   def index
+    target = params[:target].presence&.to_sym
+    status = params[:status]
+
     @notifications = current_user.notifications
-                                 .reads_with_avatar
+                                 .by_target(target)
+                                 .by_read_status(status)
                                  .order(created_at: :desc)
                                  .page(params[:page])
   end
diff --git a/app/controllers/api/reservations_controller.rb b/app/controllers/api/reservations_controller.rb
deleted file mode 100644
index 67bc3959589..00000000000
--- a/app/controllers/api/reservations_controller.rb
+++ /dev/null
@@ -1,58 +0,0 @@
-# frozen_string_literal: true
-
-class API::ReservationsController < API::BaseController
-  before_action :set_reservation, only: %i[destroy]
-
-  def index
-    @reservations = Reservation.where(
-      date: params[:beggining_of_this_month]..params[:end_of_this_month]
-    ).includes(:user)
-  end
-
-  def create
-    if reservation_params[:seat_id].instance_of?(Array) || reservation_params[:date].instance_of?(Array)
-      create_reservations(seat_id: reservation_params[:seat_id], date: reservation_params[:date])
-    else
-      @reservation = Reservation.new(reservation_params)
-      @reservation.user = current_user
-      if @reservation.save
-        render :create, status: :created
-      else
-        render status: :bad_request, json: { message: @reservation.errors.full_messages }
-      end
-    end
-  end
-
-  def destroy
-    @reservation.destroy
-  end
-
-  private
-
-  def reservation_params
-    params.require(:reservation).permit(
-      :date,
-      :seat_id,
-      { seat_id: [] },
-      { date: [] }
-    )
-  end
-
-  def set_reservation
-    @reservation = current_user.reservations.find(params[:id])
-  end
-
-  def create_reservations(seat_id:, date:)
-    @reservations = []
-    values = seat_id if seat_id.instance_of?(Array) && date.instance_of?(String)
-    values = date if date.instance_of?(Array) && seat_id.instance_of?(Integer)
-    values.each do |value|
-      @reservation = Reservation.new(seat_id: value, date: date) if seat_id.instance_of?(Array)
-      @reservation = Reservation.new(seat_id: seat_id, date: value) if date.instance_of?(Array)
-      @reservation.user = current_user
-      @reservation.save
-      @reservations << @reservation
-    end
-    render :index, status: :created
-  end
-end
diff --git a/app/controllers/books/borrowed_controller.rb b/app/controllers/books/borrowed_controller.rb
deleted file mode 100644
index f6e304fe14b..00000000000
--- a/app/controllers/books/borrowed_controller.rb
+++ /dev/null
@@ -1,7 +0,0 @@
-# frozen_string_literal: true
-
-class Books::BorrowedController < ApplicationController
-  def index
-    @books = Book.borrowed.order(:title).page(params[:page])
-  end
-end
diff --git a/app/controllers/books/search_results_controller.rb b/app/controllers/books/search_results_controller.rb
deleted file mode 100644
index 9c72f4f1fbf..00000000000
--- a/app/controllers/books/search_results_controller.rb
+++ /dev/null
@@ -1,9 +0,0 @@
-# frozen_string_literal: true
-
-class Books::SearchResultsController < ApplicationController
-  before_action :require_login
-
-  def index
-    @search_results = Book.search(params[:word]).page(params[:page])
-  end
-end
diff --git a/app/controllers/books_controller.rb b/app/controllers/books_controller.rb
deleted file mode 100644
index a4a3a4dddd6..00000000000
--- a/app/controllers/books_controller.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-class BooksController < ApplicationController
-  before_action :require_login
-
-  def index
-    @books = Book.order(:title).page(params[:page])
-  end
-
-  def show
-    @book = Book.find(params[:id])
-  end
-end
diff --git a/app/controllers/borrowings_controller.rb b/app/controllers/borrowings_controller.rb
deleted file mode 100644
index 531bd6bf1ad..00000000000
--- a/app/controllers/borrowings_controller.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-# frozen_string_literal: true
-
-class BorrowingsController < ApplicationController
-  before_action :require_login, only: %i[create destroy]
-
-  def create
-    book = Book.find(params[:book_id])
-    current_user.borrow(book)
-    redirect_to book_url(book), notice: '書籍を借りました。'
-  end
-
-  def destroy
-    book = Book.find(params[:book_id])
-    current_user.give_back(book)
-    redirect_to book_url(book), notice: '書籍を返却しました。'
-  end
-end
diff --git a/app/controllers/concerns/authentication.rb b/app/controllers/concerns/authentication.rb
index 107ad45de5d..8f0460fb571 100644
--- a/app/controllers/concerns/authentication.rb
+++ b/app/controllers/concerns/authentication.rb
@@ -57,6 +57,12 @@ def require_admin_login
     redirect_to root_path, alert: '管理者としてログインしてください'
   end
 
+  def require_admin_or_mentor_login
+    return if admin_or_mentor_login?
+
+    redirect_to root_path, alert: '管理者・メンターとしてログインしてください'
+  end
+
   def require_staff_login
     return if staff_login?
 
diff --git a/app/controllers/events_controller.rb b/app/controllers/events_controller.rb
index 49b2c61ee92..c07593ff211 100644
--- a/app/controllers/events_controller.rb
+++ b/app/controllers/events_controller.rb
@@ -5,12 +5,7 @@ class EventsController < ApplicationController
   before_action :set_event, only: %i[show edit update destroy]
   before_action :set_footprints, only: %i[show]
 
-  def index
-    @events = Event.with_avatar
-                   .includes(:comments, :users)
-                   .order(created_at: :desc)
-                   .page(params[:page])
-  end
+  def index; end
 
   def show
     footprint!
diff --git a/app/controllers/home_controller.rb b/app/controllers/home_controller.rb
index 19d3c67422b..766ee27a688 100644
--- a/app/controllers/home_controller.rb
+++ b/app/controllers/home_controller.rb
@@ -12,8 +12,6 @@ def index
                                      .order(published_at: :desc)
                                      .limit(5)
         @completed_learnings = current_user.learnings.where(status: 3).order(updated_at: :desc)
-        @my_seat_today = current_user.reservations.find_by(date: Date.current)&.seat&.name
-        @reservations_for_today = Reservation.where(date: Date.current).to_a
         set_required_fields
         render aciton: :index
       end
diff --git a/app/controllers/notifications/unread_controller.rb b/app/controllers/notifications/unread_controller.rb
deleted file mode 100644
index 4c7318914d6..00000000000
--- a/app/controllers/notifications/unread_controller.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-# frozen_string_literal: true
-
-class Notifications::UnreadController < ApplicationController
-  def index; end
-end
diff --git a/app/controllers/notifications_controller.rb b/app/controllers/notifications_controller.rb
index 697bdc4b3f1..d0d5959e5b5 100644
--- a/app/controllers/notifications_controller.rb
+++ b/app/controllers/notifications_controller.rb
@@ -4,7 +4,9 @@ class NotificationsController < ApplicationController
   before_action :require_login, only: %i[index show]
   before_action :set_my_notification, only: %i[show]
 
-  def index; end
+  def index
+    @target = params[:target]
+  end
 
   def show
     path = @notification.read_attribute :path
diff --git a/app/controllers/practices_controller.rb b/app/controllers/practices_controller.rb
index 98a8ca4bc15..d537ea0110f 100644
--- a/app/controllers/practices_controller.rb
+++ b/app/controllers/practices_controller.rb
@@ -2,7 +2,8 @@
 
 class PracticesController < ApplicationController
   before_action :require_login
-  before_action :require_admin_login, except: %i[show]
+  before_action :require_admin_login, only: %i[new create]
+  before_action :require_admin_or_mentor_login, only: %i[edit update]
   before_action :set_course, only: %i[new]
   before_action :set_practice, only: %i[show edit update]
 
diff --git a/app/controllers/reservation_calenders_controller.rb b/app/controllers/reservation_calenders_controller.rb
deleted file mode 100644
index 217449728ad..00000000000
--- a/app/controllers/reservation_calenders_controller.rb
+++ /dev/null
@@ -1,47 +0,0 @@
-# frozen_string_literal: true
-
-class ReservationCalendersController < ApplicationController
-  before_action :set_seats, only: %w[show]
-
-  def index
-    this_month = l(Date.new(Date.current.year, Date.current.month, 1), format: :ym)
-    redirect_to action: 'show', id: this_month
-  end
-
-  def show
-    days_of_this_month = beggining_of_this_month..beggining_of_this_month.end_of_month
-    @reservations = Reservation.where(date: days_of_this_month).includes(:user)
-
-    @memos = Memo.one_month_memos(beggining_of_this_month)
-    @holidays = Holiday.one_month_holidays(beggining_of_this_month)
-
-    @this_month = beggining_of_this_month
-    @prev_month = beggining_of_this_month.prev_month
-    @next_month = beggining_of_this_month.next_month
-  end
-
-  private
-
-  def beggining_of_this_month
-    if @beggining_of_this_month.nil?
-      @beggining_of_this_month = if year_and_month?(params[:id])
-                                   Date.new(params[:id].slice(0, 4).to_i, params[:id].slice(4, 2).to_i, 1)
-                                 else
-                                   Date.current.beginning_of_month
-                                 end
-    else
-      @beggining_of_this_month
-    end
-  end
-
-  def year_and_month?(params_id)
-    /^\d{4}(0[1-9]|1[0-2])$/.match?(params_id)
-  end
-
-  def set_seats
-    @seats = []
-    Seat.all.order(:name).each do |seat|
-      @seats.push(id: seat['id'], name: seat['name'])
-    end
-  end
-end
diff --git a/app/decorators/book_decorator.rb b/app/decorators/book_decorator.rb
deleted file mode 100644
index 742a87364de..00000000000
--- a/app/decorators/book_decorator.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-module BookDecorator
-  def borrowing_user_name
-    users.first.login_name
-  end
-
-  def borrowing_user_avatar
-    users.first.avatar_url
-  end
-
-  def borrowing_days
-    borrowed_date = borrowings.first.created_at
-    (Time.current - borrowed_date).to_i / (60 * 60 * 24)
-  end
-end
diff --git a/app/javascript/comments.vue b/app/javascript/comments.vue
index a2e4f828e1d..84dcaa61f22 100644
--- a/app/javascript/comments.vue
+++ b/app/javascript/comments.vue
@@ -1,7 +1,7 @@
 <template lang="pug">
-.thread-comments(v-if='loaded === false')
+#comments.thread-comments(v-if='loaded === false')
   commentPlaceholder(v-for='num in placeholderCount', :key='num')
-.thread-comments(v-else)
+#comments.thread-comments(v-else)
   comment(
     v-for='(comment, index) in comments',
     :key='comment.id',
diff --git a/app/javascript/event.vue b/app/javascript/event.vue
new file mode 100644
index 00000000000..88a2ea5ee7c
--- /dev/null
+++ b/app/javascript/event.vue
@@ -0,0 +1,61 @@
+<template lang="pug">
+.thread-list-item(:class='{ "is-wip": event.wip }')
+  .thread-list-item__inner
+    .thread-list-item__author
+      user-icon(
+        :user='event.user',
+        link_class='a-user-name',
+        threadClassSuffix='-list-item'
+      )
+    .thread-list-item__rows
+      .thread-list-item__row
+        .thread-list-item-title
+          .thread-list-item-title__icon.is-wip(v-if='event.wip') WIP
+          h2.thread-list-item-title__title(itemprop='name')
+            a.thread-list-item-title__link(:href='event.url', itemprop='url')
+              | {{ event.title }}
+      .thread-list-item__row
+        .thread-list-item-name
+          a.a-user-name(:href='event.user.url')
+            | {{ event.user.long_name }}
+      .thread-list-item__row
+        .thread-list-item-meta
+          .thread-list-item-meta__items
+            .thread-list-item-meta__item
+              time.a-meta(:datetime='event.start_at')
+                span.a-meta__label
+                  | 開催日時
+                span.a-meta__value
+                  | {{ event.start_at_localized }}
+            .thread-list-item-meta__item
+              .thread-list-item-comment
+                .thread-list-item-comment__label
+                  | 参加者
+                .thread-list-item-comment__count
+                  | （{{ event.participants_count }}名 / {{ event.capacity }}名）
+            .thread-list-item-meta__item(v-if='event.waitlist_count > 0')
+              .thread-list-item-comment
+                .thread-list-item-comment__label
+                  | 補欠者
+                .thread-list-item-comment__count
+                  | ({{ event.waitlist_count }}名)
+            .thread-list-item-meta__item(v-if='event.comments_count > 0')
+              .thread-list-item-comment
+                .thread-list-item-comment__label
+                  | コメント
+                .thread-list-item-comment__count
+                  | （{{ event.comments_count }}）
+</template>
+
+<script>
+import UserIcon from './user-icon'
+
+export default {
+  components: {
+    'user-icon': UserIcon
+  },
+  props: {
+    event: { type: Object, required: true }
+  }
+}
+</script>
diff --git a/app/javascript/events.js b/app/javascript/events.js
new file mode 100644
index 00000000000..25209753191
--- /dev/null
+++ b/app/javascript/events.js
@@ -0,0 +1,12 @@
+import Vue from 'vue'
+import Events from './events.vue'
+
+document.addEventListener('DOMContentLoaded', () => {
+  const selector = '#js-events'
+  const events = document.querySelector(selector)
+  if (events) {
+    new Vue({
+      render: (h) => h(Events)
+    }).$mount(selector)
+  }
+})
diff --git a/app/javascript/events.vue b/app/javascript/events.vue
new file mode 100644
index 00000000000..40dfe8e7244
--- /dev/null
+++ b/app/javascript/events.vue
@@ -0,0 +1,96 @@
+<template lang="pug">
+.page-body
+  .container(v-if='!loaded')
+    | ロード中
+  .container.is-md(v-else)
+    nav.pagination(v-if='totalPages > 1')
+      pager(v-bind='pagerProps')
+    .thread-list.a-card
+      event(v-for='event in events', :key='event.id', :event='event')
+    nav.pagination(v-if='totalPages > 1')
+      pager(v-bind='pagerProps')
+</template>
+
+<script>
+import Event from './event'
+import Pager from './pager'
+
+export default {
+  components: {
+    event: Event,
+    pager: Pager
+  },
+  data() {
+    return {
+      events: [],
+      totalPages: 0,
+      currentPage: this.getCurrentPage(),
+      loaded: false
+    }
+  },
+  computed: {
+    url() {
+      return `/api/events?page=${this.currentPage}`
+    },
+    pagerProps() {
+      return {
+        initialPageNumber: this.currentPage,
+        pageCount: this.totalPages,
+        pageRange: 5,
+        clickHandle: this.paginateClickCallback
+      }
+    }
+  },
+  created() {
+    window.onpopstate = () => {
+      this.currentPage = this.getCurrentPage()
+      this.getEventsPerPage()
+    }
+    this.getEventsPerPage()
+  },
+  methods: {
+    token() {
+      const meta = document.querySelector('meta[name="csrf-token"]')
+      return meta ? meta.getAttribute('content') : ''
+    },
+    getEventsPerPage() {
+      fetch(this.url, {
+        method: 'GET',
+        headers: {
+          'Content-Type': 'application/json; charset=utf-8',
+          'X-Requested-With': 'XMLHttpRequest',
+          'X-CSRF-Token': this.token()
+        },
+        credentials: 'same-origin',
+        redirect: 'manual'
+      })
+        .then((response) => response.json())
+        .then((json) => {
+          this.events = json.events
+          this.totalPages = json.total_pages
+          this.loaded = true
+        })
+        .catch((error) => {
+          console.warn('Failed to parsing', error)
+        })
+    },
+    getCurrentPage() {
+      const params = new URLSearchParams(location.search)
+      const page = params.get('page')
+      return parseInt(page) || 1
+    },
+    paginateClickCallback(pageNumber) {
+      this.currentPage = pageNumber
+      this.getEventsPerPage()
+
+      const url = new URL(location.href)
+      if (pageNumber === 1) {
+        url.searchParams.delete('page')
+      } else {
+        url.searchParams.set('page', pageNumber)
+      }
+      history.pushState(history.state, '', url)
+    }
+  }
+}
+</script>
diff --git a/app/javascript/notifications.js b/app/javascript/notifications.js
index 8195f6f8180..6a703292739 100644
--- a/app/javascript/notifications.js
+++ b/app/javascript/notifications.js
@@ -6,12 +6,14 @@ document.addEventListener('DOMContentLoaded', () => {
   const notifications = document.querySelector(selector)
   if (notifications) {
     const isMentor = notifications.getAttribute('data-is-mentor')
+    const target = notifications.getAttribute('data-target')
     new Vue({
       render: (h) =>
         h(Notifications, {
           props: {
             // 文字列を真偽値に変換して渡す
-            isMentor: isMentor === 'true'
+            isMentor: isMentor === 'true',
+            target: target
           }
         })
     }).$mount(selector)
diff --git a/app/javascript/notifications.vue b/app/javascript/notifications.vue
index 3d83c3c383c..2512d34a7bf 100644
--- a/app/javascript/notifications.vue
+++ b/app/javascript/notifications.vue
@@ -1,5 +1,5 @@
 <template lang="pug">
-.container(v-if='!loaded')
+.container.is-md(v-if='!loaded')
   | ロード中
 .container(v-else-if='notifications.length === 0')
   .o-empty-message
@@ -9,7 +9,7 @@
       | 未読の通知はありません
     p.o-empty-message__text(v-else)
       | 通知はありません
-.container(v-else)
+.container.is-md(v-else)
   nav.pagination(v-if='totalPages > 1')
     pager(v-bind='pagerProps')
   .thread-list.a-card
@@ -40,6 +40,10 @@ export default {
   props: {
     isMentor: {
       type: Boolean
+    },
+    target: {
+      type: String,
+      required: true
     }
   },
   data() {
@@ -53,13 +57,14 @@ export default {
   computed: {
     url() {
       if (this.isUnreadPage) {
-        return `/api/notifications/unread.json?page=${this.currentPage}`
+        return `/api/notifications.json?page=${this.currentPage}&status=unread&target=${this.target}`
       } else {
-        return `/api/notifications.json?page=${this.currentPage}`
+        return `/api/notifications.json?page=${this.currentPage}&target=${this.target}`
       }
     },
     isUnreadPage() {
-      return location.pathname.includes('unread')
+      const params = new URLSearchParams(location.search)
+      return params.get('status') !== null && params.get('status') === 'unread'
     },
     pagerProps() {
       return {
diff --git a/app/javascript/notifications_bell.vue b/app/javascript/notifications_bell.vue
index c2fef5c8aa3..230fd55cc12 100644
--- a/app/javascript/notifications_bell.vue
+++ b/app/javascript/notifications_bell.vue
@@ -31,7 +31,7 @@ li.header-links__item(v-bind:class='hasCountClass')
                 p.test-notification-message {{ notification.message }}
               time.header-notifications-item_created-at {{ createdAtFromNow(notification.created_at) }}
       footer.header-dropdown__footer
-        a.header-dropdown__footer-link(href='/notifications/unread') 全ての未読通知
+        a.header-dropdown__footer-link(href='/notifications?status=unread') 全ての未読通知
         a.header-dropdown__footer-link(href='/notifications') 全ての通知
         a.header-dropdown__footer-link(
           href='/notifications/allmarks',
@@ -64,7 +64,7 @@ export default {
     }
   },
   created() {
-    fetch(`/api/notifications/unread.json`, {
+    fetch(`/api/notifications.json?status=unread`, {
       method: 'GET',
       headers: {
         'X-Requested-With': 'XMLHttpRequest'
diff --git a/app/javascript/packs/application.js b/app/javascript/packs/application.js
index 16b2b764e72..975f90e66c7 100644
--- a/app/javascript/packs/application.js
+++ b/app/javascript/packs/application.js
@@ -23,7 +23,6 @@ require('../category-select.js')
 require('../grass.js')
 require('../fileinput.js')
 require('../reaction.js')
-require('../reservations.js')
 require('../practice_memo.js')
 require('../card.js')
 require('../watch-toggle.js')
@@ -53,3 +52,4 @@ require('../user_mentor_memo.js')
 require('../mentor-mode.js')
 require('../bookmark.js')
 require('../bookmarks.js')
+require('../events.js')
diff --git a/app/javascript/product.vue b/app/javascript/product.vue
index 4fd97d3f3a1..d54dc5981cc 100644
--- a/app/javascript/product.vue
+++ b/app/javascript/product.vue
@@ -1,5 +1,5 @@
 <template lang="pug">
-.thread-list-item(:class='product.wip ? "is-wip" : ""')
+.thread-list-item.has-assigned(:class='product.wip ? "is-wip" : ""')
   .thread-list-item__strip-label(v-if='notResponded || unassigned')
     .thread-list-item__elapsed-days.is-reply-warning.is-only-mentor(
       v-if='isLatestProductSubmittedJust5days'
@@ -29,25 +29,26 @@
           .thread-list-item-meta__items
             .thread-list-item-meta__item
               a.a-user-name(:href='product.user.url') {{ product.user.login_name }}
+      .thread-list-item__row
+        .thread-list-item-meta
+          .thread-list-item-meta__items
             .thread-list-item-meta__item(v-if='product.wip')
               .a-meta 提出物作成中
             .thread-list-item-meta__item(v-else-if='product.published_at')
-              time.a-meta(datetime='product.published_at_date_time')
+              time.a-meta
                 span.a-meta__label 提出日
                 | {{ product.published_at }}
             .thread-list-item-meta__item(v-else)
-              time.a-meta(datetime='product.created_at_date_time')
+              time.a-meta
                 span.a-meta__label 提出日
                 | {{ product.created_at }}
-            time.a-meta(
-              v-if='product.updated_at',
-              datetime='product.updated_at_date_time'
-            )
-              span.a-meta__label 更新
-              | {{ product.updated_at }}
+            .thread-list-item-meta__item
+              time.a-meta(v-if='product.updated_at')
+                span.a-meta__label 更新
+                | {{ product.updated_at }}
 
+      hr.thread-list-item__row-separator(v-if='product.comments.size > 0')
       .thread-list-item__row(v-if='product.comments.size > 0')
-        hr.thread-list-item__row-separator
         .thread-list-item-meta
           .thread-list-item-meta__items
             .thread-list-item-meta__item
@@ -67,10 +68,33 @@
                       :src='user.avatar_url',
                       :class='[roleClass, daimyoClass]'
                     )
-                time.a-meta(
-                  datetime='product.comments.last_created_at_date_time'
-                )
-                  | 〜 {{ product.comments.last_created_at }}
+
+            .thread-list-item-meta__item(
+              v-if='product.self_last_comment_at_date_time && product.mentor_last_comment_at_date_time'
+            )
+              time.a-meta(
+                v-if='product.self_last_comment_at_date_time > product.mentor_last_comment_at_date_time'
+              )
+                | 〜 {{ product.self_last_comment_at }}（
+                strong
+                  | 提出者
+                | ）
+              time.a-meta(
+                v-if='product.self_last_comment_at_date_time < product.mentor_last_comment_at_date_time'
+              )
+                | 〜 {{ product.mentor_last_comment_at }}（メンター）
+
+            .thread-list-item-meta__item(
+              v-else-if='product.self_last_comment_at_date_time || product.mentor_last_comment_at_date_time'
+            )
+              time.a-meta(v-if='product.self_last_comment_at_date_time')
+                | 〜 {{ product.self_last_comment_at }}（
+                strong
+                  | 提出者
+                | ）
+              time.a-meta(v-else-if='product.mentor_last_comment_at_date_time')
+                | 〜 {{ product.mentor_last_comment_at }}（メンター）
+
     .stamp.stamp-approve(v-if='product.checks.size > 0')
       h2.stamp__content.is-title 確認済
       time.stamp__content.is-created-at {{ product.checks.last_created_at }}
diff --git a/app/javascript/report.vue b/app/javascript/report.vue
index 0245ad9b3d4..b729aa1304c 100644
--- a/app/javascript/report.vue
+++ b/app/javascript/report.vue
@@ -37,8 +37,8 @@
             .thread-list-item-meta__item
               time.a-meta {{ report.reportedOn }}
                 | の日報
+      hr.thread-list-item__row-separator
       .thread-list-item__row(v-if='report.hasAnyComments')
-        hr.thread-list-item__row-separator
         .thread-list-item-meta
           .thread-list-item-meta__items
             .thread-list-item-meta__item
diff --git a/app/javascript/reservation.vue b/app/javascript/reservation.vue
deleted file mode 100644
index 91d4a90f4d7..00000000000
--- a/app/javascript/reservation.vue
+++ /dev/null
@@ -1,50 +0,0 @@
-<template lang="pug">
-.reservation
-  template(v-if='this.currentUserId == this.userId')
-    #cancel-reservation.reservations__seat-action.is-reserved.is-me(
-      @click='deleteReservation'
-    )
-      | {{ this.label }}
-  template(v-else)
-    #cancel-reservation.reservations__seat-action.is-reserved.is-not-me(
-      @click='linkToUser'
-    )
-      | {{ this.label }}
-</template>
-<script>
-export default {
-  props: {
-    parentReservation: { type: Object, required: true },
-    currentUserId: { type: String, required: true }
-  },
-  computed: {
-    id: function () {
-      return this.parentReservation !== null ? this.parentReservation.id : null
-    },
-    userId: function () {
-      return this.parentReservation !== null
-        ? this.parentReservation.user_id
-        : null
-    },
-    label: function () {
-      if (this.parentReservation === null) {
-        return null
-      }
-
-      return this.parentReservation.admin
-        ? 'X'
-        : this.parentReservation.login_name
-    }
-  },
-  methods: {
-    deleteReservation: function () {
-      if (confirm('予約を削除しますか？')) {
-        this.$emit('delete', this.id)
-      }
-    },
-    linkToUser: function () {
-      location.href = `/users/${this.parentReservation.user_id}`
-    }
-  }
-}
-</script>
diff --git a/app/javascript/reservations.js b/app/javascript/reservations.js
deleted file mode 100644
index 7ee202719f0..00000000000
--- a/app/javascript/reservations.js
+++ /dev/null
@@ -1,26 +0,0 @@
-import Vue from 'vue'
-import Reservations from './reservations.vue'
-
-document.addEventListener('DOMContentLoaded', () => {
-  const reservations = document.getElementById('js-reservations')
-  if (reservations) {
-    const reservationsBegginingOfThisMonth = reservations.getAttribute(
-      'data-reservations-beggining-of-this-month'
-    )
-    const reservationsEndOfThisMonth = reservations.getAttribute(
-      'data-reservations-end-of-this-month'
-    )
-    const currentUserId = reservations.getAttribute('data-current-user-id')
-
-    new Vue({
-      render: (h) =>
-        h(Reservations, {
-          props: {
-            reservationsBegginingOfThisMonth: reservationsBegginingOfThisMonth,
-            reservationsEndOfThisMonth: reservationsEndOfThisMonth,
-            currentUserId: currentUserId
-          }
-        })
-    }).$mount('#js-reservations')
-  }
-})
diff --git a/app/javascript/reservations.vue b/app/javascript/reservations.vue
deleted file mode 100644
index 7c80e46cb8b..00000000000
--- a/app/javascript/reservations.vue
+++ /dev/null
@@ -1,229 +0,0 @@
-<template lang="pug">
-.reservations__outer
-  .reservations
-    .reservations__calender
-      .reservations__calender-header
-        .reservations__calender-header-label.is-day
-          |
-        .reservations__calender-header-label.is-seat(
-          v-for='seat in seats',
-          :key='seat.id',
-          @click='createReservationForOneMonth(seat.id)'
-        )
-          | {{ seat.name }}
-        .reservations__calender-header-label.is-memo
-          | メモ
-      .reservations__day-items
-        .reservations__day-item.date(
-          v-for='oneDay in thisMonths',
-          v-bind:class='isHoliday(reservationsHolidayJps[oneDay["ymd"]])'
-        )
-          .reservations__day-item-value.reservations__day.is-day(
-            @click='createReservationForOneDay(oneDay["ymd"])'
-          ) {{ oneDay["d_jp"] }}
-          .reservations__day-item-value.reservations__seat.is-seat(
-            v-for='seat in seats',
-            :key='seat.id',
-            v-bind:id='reservationHashId(oneDay["ymd"], seat.id)'
-          )
-            #reserve-seat.reservations__seat-action(
-              v-if='reservations[`${oneDay["ymd"]}-${seat.id}`] === undefined',
-              @click='createReservation(oneDay["ymd"], seat.id)'
-            )
-              |
-            reservation(
-              v-else,
-              :currentUserId='currentUserId',
-              :parentReservation='reservations[`${oneDay["ymd"]}-${seat.id}`]',
-              @delete='deleteReservation'
-            )
-          .reservations__day-item-value.is-memo(
-            v-if='adminLogin == 1',
-            v-bind:id='memoId(oneDay["ymd"])'
-          )
-            memo(:memo='memos[oneDay["ymd"]]', :date='oneDay["ymd"]')
-          .reservations__day-item-value.is-memo(
-            v-else,
-            v-bind:id='memoId(oneDay["ymd"])'
-          )
-            template(v-if='memos[oneDay["ymd"]] === undefined')
-              |
-            template(v-else)
-              | {{ memoBody(oneDay) }}
-</template>
-<script>
-import Reservation from './reservation.vue'
-import Memo from './memo.vue'
-import dayjs from 'dayjs'
-import ja from 'dayjs/locale/ja'
-dayjs.locale(ja)
-
-export default {
-  components: {
-    reservation: Reservation,
-    memo: Memo
-  },
-  props: {
-    reservationsBegginingOfThisMonth: { type: String, required: true },
-    reservationsEndOfThisMonth: { type: String, required: true },
-    currentUserId: { type: String, required: true }
-  },
-  data() {
-    return {
-      thisMonths: [],
-      reservation: [],
-      reservations: {},
-      seats: {},
-      reservationsHolidayJps: {},
-      memos: {},
-      adminLogin: ''
-    }
-  },
-  created: function () {
-    this.reservationsHolidayJps = JSON.parse(
-      document.querySelector('#js-reservations-data-holiday-jps').innerText
-    )
-    this.memos = JSON.parse(document.querySelector('#js-memos-data').innerText)
-    this.seats = JSON.parse(document.querySelector('#js-seats-data').innerText)
-
-    if (!(document.querySelector('#js-admin-login') == null)) {
-      this.adminLogin = document.querySelector('#js-admin-login').innerText
-    }
-
-    fetch(
-      `/api/reservations.json?beggining_of_this_month=${this.reservationsBegginingOfThisMonth}&end_of_this_month=${this.reservationsEndOfThisMonth}`,
-      {
-        method: 'GET',
-        headers: {
-          'X-Requested-With': 'XMLHttpRequest'
-        },
-        credentials: 'same-origin',
-        redirect: 'manual'
-      }
-    )
-      .then((response) => {
-        return response.json()
-      })
-      .then((json) => {
-        json.forEach((c) => {
-          this.$set(this.reservations, `${c.date}-${c.seat_id}`, c)
-        })
-      })
-      .catch((error) => {
-        console.warn('Failed to parsing', error)
-      })
-
-    this.thisMonths = this.getDates(
-      new Date(this.reservationsBegginingOfThisMonth),
-      new Date(this.reservationsEndOfThisMonth)
-    )
-  },
-  methods: {
-    token() {
-      const meta = document.querySelector('meta[name="csrf-token"]')
-      return meta ? meta.getAttribute('content') : ''
-    },
-    getDates: function (startDate, stopDate) {
-      const dateArray = []
-      let currentDate = startDate
-      while (currentDate <= stopDate) {
-        const oneDay = {}
-        oneDay.ymd = dayjs(new Date(currentDate)).format('YYYY-MM-DD')
-        oneDay.d_jp = dayjs(new Date(currentDate)).format('D日(ddd)')
-        dateArray.push(oneDay)
-        currentDate = dayjs(currentDate).add(1, 'd')
-      }
-      return dateArray
-    },
-    createReservation: function (date, seatId) {
-      const params = {
-        seat_id: seatId,
-        date: date
-      }
-      fetch(`/api/reservations`, {
-        method: 'POST',
-        headers: {
-          'Content-Type': 'application/json; charset=utf-8',
-          'X-Requested-With': 'XMLHttpRequest',
-          'X-CSRF-Token': this.token()
-        },
-        credentials: 'same-origin',
-        redirect: 'manual',
-        body: JSON.stringify(params)
-      })
-        .then((response) => {
-          return response.json()
-        })
-        .then((json) => {
-          if (Array.isArray(json)) {
-            json.forEach((c) => {
-              this.$set(this.reservations, `${c.date}-${c.seat_id}`, c)
-            })
-          } else {
-            if (json.message === undefined) {
-              this.$set(this.reservations, `${json.date}-${json.seat_id}`, json)
-            } else {
-              alert(json.message)
-            }
-          }
-        })
-        .catch((error) => {
-          console.warn('Failed to parsing', error)
-        })
-    },
-    deleteReservation: function (id) {
-      fetch(`/api/reservations/${id}.json`, {
-        method: 'DELETE',
-        headers: {
-          'X-Requested-With': 'XMLHttpRequest',
-          'X-CSRF-Token': this.token()
-        },
-        credentials: 'same-origin',
-        redirect: 'manual'
-      })
-        .then(() => {
-          for (const reservation in this.reservations) {
-            if (this.reservations[reservation].id === id) {
-              this.$delete(this.reservations, reservation)
-            }
-          }
-        })
-        .catch((error) => {
-          console.warn('Failed to parsing', error)
-        })
-    },
-    isHoliday(isHoliday) {
-      return {
-        'is-holiday': isHoliday === 1
-      }
-    },
-    reservationHashId(date, seatId) {
-      return `reservation-${date}-${seatId}`
-    },
-    memoBody(oneDay) {
-      return this.memos[oneDay.ymd].body
-    },
-    memoId(oneDay) {
-      return `memo-${oneDay}`
-    },
-    createReservationForOneMonth(seatId) {
-      const multipleDays = []
-      if (this.adminLogin === 1) {
-        this.thisMonths.forEach((oneDay) => {
-          multipleDays.push(oneDay.ymd)
-        })
-        this.createReservation(multipleDays, seatId)
-      }
-    },
-    createReservationForOneDay(oneDay) {
-      const seatIds = []
-      if (this.adminLogin === 1) {
-        this.seats.forEach((seat) => {
-          seatIds.push(seat.id)
-        })
-        this.createReservation(oneDay, seatIds)
-      }
-    }
-  }
-}
-</script>
diff --git a/app/javascript/user-practice-progress.vue b/app/javascript/user-practice-progress.vue
index b15e1f52602..dd6d18038b4 100644
--- a/app/javascript/user-practice-progress.vue
+++ b/app/javascript/user-practice-progress.vue
@@ -9,8 +9,8 @@
       role='progressbar',
       :style='`width: ${roundedPercentage}`'
     )
-  .completed-practices-progress__percentage-number
-    | {{ roundedPercentage }}
+  .completed-practices-progress__number
+    | {{ fraction }}
 </template>
 <script>
 export default {
@@ -19,7 +19,8 @@ export default {
   },
   data() {
     return {
-      percentage: this.user.cached_completed_percentage
+      percentage: this.user.cached_completed_percentage,
+      fraction: this.user.completed_fraction
     }
   },
   computed: {
diff --git a/app/models/book.rb b/app/models/book.rb
deleted file mode 100644
index 2962e5cd43a..00000000000
--- a/app/models/book.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-# frozen_string_literal: true
-
-class Book < ApplicationRecord
-  has_many :borrowings, dependent: :destroy
-  has_many :users, through: :borrowings
-
-  validates :title, presence: true
-  validates :isbn, presence: true
-  validates :borrowed, inclusion: { in: [true, false] }
-  paginates_per 20
-
-  scope :borrowed, -> { where(borrowed: true) }
-
-  def self.search(word)
-    Book.ransack(title_cont: word).result
-  end
-end
diff --git a/app/models/borrowing.rb b/app/models/borrowing.rb
deleted file mode 100644
index 9b338f56ec2..00000000000
--- a/app/models/borrowing.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-# frozen_string_literal: true
-
-class Borrowing < ApplicationRecord
-  belongs_to :user
-  belongs_to :book
-end
diff --git a/app/models/comment.rb b/app/models/comment.rb
index 51318f596af..14fb3cc306d 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -8,6 +8,7 @@ class Comment < ApplicationRecord
   belongs_to :user, touch: true
   belongs_to :commentable, polymorphic: true
   after_create CommentCallbacks.new
+  after_update CommentCallbacks.new
   after_destroy CommentCallbacks.new
   alias sender user
 
diff --git a/app/models/comment_callbacks.rb b/app/models/comment_callbacks.rb
index 188914c63fe..6af984bffd4 100644
--- a/app/models/comment_callbacks.rb
+++ b/app/models/comment_callbacks.rb
@@ -11,17 +11,55 @@ def after_create(comment)
 
     return unless comment.commentable.instance_of?(Product)
 
+    update_last_comment_at(comment)
     delete_product_cache(comment.commentable.id)
   end
 
+  def after_update(comment)
+    return unless comment.commentable.instance_of?(Product)
+
+    update_last_comment_at(comment)
+  end
+
   def after_destroy(comment)
     return unless comment.commentable.instance_of?(Product)
 
+    delete_last_comment_at(comment.commentable.id)
     delete_product_cache(comment.commentable.id)
   end
 
   private
 
+  def reset_last_comment_at
+    product.mentor_last_comment_at = nil
+    product.self_last_comment_at = nil
+  end
+
+  def delete_last_comment_at(product_id)
+    product = Product.find(product_id)
+
+    reset_last_comment_at
+
+    product.comments.each do |comment|
+      if comment.user.mentor
+        product.mentor_last_comment_at = comment.updated_at
+      elsif comment.user == product.user
+        product.self_last_comment_at = comment.updated_at
+      end
+    end
+    product.save!
+  end
+
+  def update_last_comment_at(comment)
+    product = Product.find(comment.commentable.id)
+    if comment.user.mentor
+      product.mentor_last_comment_at = comment.updated_at
+    elsif comment.user == product.user
+      product.self_last_comment_at = comment.updated_at
+    end
+    product.save!
+  end
+
   def notify_comment(comment)
     NotificationFacade.came_comment(
       comment,
diff --git a/app/models/notification.rb b/app/models/notification.rb
index 382d6202f19..5d08f8ca6e2 100644
--- a/app/models/notification.rb
+++ b/app/models/notification.rb
@@ -1,6 +1,15 @@
 # frozen_string_literal: true
 
 class Notification < ApplicationRecord
+  TARGETS_TO_KINDS = {
+    announcement: [:announced],
+    mention: [:mentioned],
+    comment: %i[came_comment answered],
+    check: [:checked],
+    watching: [:watching],
+    following_report: [:following_report]
+  }.freeze
+
   belongs_to :user
   belongs_to :sender, class_name: 'User'
 
@@ -33,8 +42,11 @@ class Notification < ApplicationRecord
   }
 
   scope :with_avatar, -> { preload(sender: { avatar_attachment: :blob }) }
-  scope :reads_with_avatar, -> { reads.with_avatar }
-  scope :unreads_with_avatar, -> { unreads.with_avatar.limit(99) }
+  scope :by_read_status, ->(status) { status == 'unread' ? unreads.with_avatar.limit(99) : reads.with_avatar }
+
+  scope :by_target, lambda { |target|
+    target ? where(kind: TARGETS_TO_KINDS[target]) : all
+  }
 
   def self.came_comment(comment, receiver, message)
     Notification.create!(
diff --git a/app/models/reservation.rb b/app/models/reservation.rb
deleted file mode 100644
index 4f1ee827fa2..00000000000
--- a/app/models/reservation.rb
+++ /dev/null
@@ -1,32 +0,0 @@
-# frozen_string_literal: true
-
-class Reservation < ApplicationRecord
-  belongs_to :user
-  belongs_to :seat
-
-  validates :seat_id, uniqueness: { scope: :date }
-  validate :after_a_month
-  validate :maximum_reservations, unless: :admin_or_trainee?
-
-  private
-
-  def after_a_month
-    return unless date > (Time.zone.today.next_month)
-
-    errors.add(:date, 'は一ヶ月先までしか予約できません')
-  end
-
-  def maximum_reservations(threshold = 5)
-    return unless date > Time.zone.today && count_reservations >= threshold
-
-    errors.add(:base, "明日以降の座席は最大#{threshold}つまでしか予約できません")
-  end
-
-  def admin_or_trainee?
-    user.admin? || user.trainee?
-  end
-
-  def count_reservations
-    user.reservations.count { |reservation| reservation.date > Time.zone.today }
-  end
-end
diff --git a/app/models/seat.rb b/app/models/seat.rb
deleted file mode 100644
index 738a890c3f5..00000000000
--- a/app/models/seat.rb
+++ /dev/null
@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class Seat < ApplicationRecord
-end
diff --git a/app/models/user.rb b/app/models/user.rb
index 74cfb75ac50..3af46bacb54 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -45,7 +45,6 @@ class User < ApplicationRecord
   belongs_to :company, optional: true
   belongs_to :course
   has_many :learnings, dependent: :destroy
-  has_many :borrowings, dependent: :destroy
   has_many :pages, dependent: :destroy
   has_many :comments,      dependent: :destroy
   has_many :reports,       dependent: :destroy
@@ -60,7 +59,6 @@ class User < ApplicationRecord
   has_many :notifications, dependent: :destroy
   has_many :events,        dependent: :destroy
   has_many :participations, dependent: :destroy
-  has_many :reservations, dependent: :destroy
   has_many :answers,      dependent: :destroy
   has_many :watches, dependent: :destroy
   has_many :articles, dependent: :destroy
@@ -97,9 +95,6 @@ class User < ApplicationRecord
            source: :practice,
            dependent: :destroy
 
-  has_many :books,
-           through: :borrowings
-
   has_many :active_relationships,
            class_name: 'Following',
            foreign_key: 'follower_id',
@@ -339,15 +334,13 @@ def away?
   end
 
   def completed_percentage
-    practices_include_progress = course.practices.where(include_progress: true)
-
-    completed_practices_include_progress =
-      practices_include_progress.joins(:learnings)
-                                .merge(Learning.complete.where(user_id: id))
-
     completed_practices_include_progress.size.to_f / practices_include_progress.size * MAX_PERCENTAGE
   end
 
+  def completed_fraction
+    "#{completed_practices_include_progress.size}/#{practices_include_progress.size}"
+  end
+
   def completed_practices_size(category)
     Practice
       .joins({ categories: :categories_practices }, :learnings)
@@ -479,20 +472,6 @@ def unread_notifications_exists?
     unread_notifications_count.positive?
   end
 
-  def borrow(book)
-    book.update(borrowed: true)
-    borrowings.create(book_id: book.id)
-  end
-
-  def give_back(book)
-    book.update(borrowed: false)
-    borrowings.find_by(book_id: book.id).destroy
-  end
-
-  def borrowing?(book)
-    borrowings.exists?(book_id: book.id)
-  end
-
   def avatar_url
     default_image_path = '/images/users/avatars/default.png'
     if avatar.attached?
@@ -565,4 +544,13 @@ def update_mentor_memo(new_memo)
   def password_required?
     new_record? || password.present?
   end
+
+  def practices_include_progress
+    course.practices.where(include_progress: true)
+  end
+
+  def completed_practices_include_progress
+    practices_include_progress.joins(:learnings)
+                              .merge(Learning.complete.where(user_id: id))
+  end
 end
diff --git a/app/views/admin/_admin_page_tabs.html.slim b/app/views/admin/_admin_page_tabs.html.slim
index 1a9f004c7af..0f4b080a953 100644
--- a/app/views/admin/_admin_page_tabs.html.slim
+++ b/app/views/admin/_admin_page_tabs.html.slim
@@ -21,11 +21,3 @@
         = link_to '企業',
           admin_companies_path,
           class: "page-tabs__item-link #{current_link(/^admin-companies/)}"
-      li.page-tabs__item
-        = link_to '書籍',
-          admin_books_path,
-          class: "page-tabs__item-link #{current_link(/^admin-books/)}"
-      li.page-tabs__item
-        = link_to '席',
-          admin_seats_path,
-          class: "page-tabs__item-link #{current_link(/^admin-seats/)}"
diff --git a/app/views/admin/books/_form.html.slim b/app/views/admin/books/_form.html.slim
deleted file mode 100644
index 2214a049bba..00000000000
--- a/app/views/admin/books/_form.html.slim
+++ /dev/null
@@ -1,15 +0,0 @@
-= render 'errors', object: book
-= form_with model: [:admin, book], local: true do |f|
-  .form__items
-    .form-item
-      = f.label :title, class: 'a-form-label'
-      = f.text_field :title, class: 'a-text-input js-warning-form'
-    .form-item
-      = f.label :isbn, class: 'a-form-label'
-      = f.text_field :isbn, class: 'a-text-input js-warning-form'
-  .form-actions
-    ul.form-actions__items
-      li.form-actions__item.is-main
-        = f.submit nil, class: 'a-button is-lg is-block is-warning'
-      li.form-actions__item.is-sub
-        = link_to 'キャンセル', admin_books_path, class: 'a-button is-md is-block is-secondary'
diff --git a/app/views/admin/books/_table.html.slim b/app/views/admin/books/_table.html.slim
deleted file mode 100644
index df0f6519422..00000000000
--- a/app/views/admin/books/_table.html.slim
+++ /dev/null
@@ -1,43 +0,0 @@
-.admin-table
-  table.admin-table__table
-    thead.admin-table__header
-      tr.admin-table__labels
-        th.admin-table__label = Book.human_attribute_name :id
-        th.admin-table__label = Book.human_attribute_name :title
-        th.admin-table__label = Book.human_attribute_name :isbn
-        th.admin-table__label 借りてる人
-        th.admin-table__label 借りてる日数
-        th.admin-table__label 印刷ページ
-        th.admin-table__label.actions 操作
-    tbody.admin-table__items
-      - books.each do |book|
-        tr.admin-table__item(id="book_#{book.id}")
-          td.admin-table__item-value
-            = book.id
-          td.admin-table__item-value
-            = link_to admin_book_path(book), target: '_blank', rel: 'noopener' do
-              = book.title
-          td.admin-table__item-value.is-text-align-center
-            = book.isbn
-          td.admin-table__item-value
-            - if book.borrowed
-              = image_tag book.borrowing_user_avatar, title: book.borrowing_user_name, class: 'admin-table__user-icon a-user-icon'
-              = link_to user_path(book.users.first), target: '_blank', rel: 'noopener' do
-                = book.borrowing_user_name
-          td.admin-table__item-value.is-text-align-center
-            - if book.borrowed
-              = "#{book.borrowing_days}日"
-          td.admin-table__item-value.is-text-align-center
-            = link_to admin_books_qrcode_path(book), class: 'a-button is-sm is-secondary is-icon', target: '_blank', rel: 'noopener' do
-              i.fas.fa-print
-          td.admin-table__item-value.is-text-align-center
-            ul.is-inline-buttons
-              li
-                = link_to edit_admin_book_path(book), class: 'a-button is-sm is-secondary is-icon' do
-                  i.fas.fa-pen
-              li
-                = link_to [:admin, book],
-                  data: { confirm: '本当によろしいですか？' },
-                  method: :delete,
-                  class: 'a-button is-sm is-danger is-icon js-delete' do
-                  i.fas.fa-trash-alt
diff --git a/app/views/admin/books/edit.html.slim b/app/views/admin/books/edit.html.slim
deleted file mode 100644
index 69f80eff47b..00000000000
--- a/app/views/admin/books/edit.html.slim
+++ /dev/null
@@ -1,19 +0,0 @@
-- title '書籍編集'
-
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-            = link_to admin_books_path, class: 'a-button is-md is-secondary is-block' do
-              i.fas.fa-plus
-              | 書籍一覧
-
-.page-tools
-  = render 'admin/admin_page_tabs'
-
-.page-body
-  .container.is-md
-    = render 'form', book: @book
diff --git a/app/views/admin/books/index.html.slim b/app/views/admin/books/index.html.slim
deleted file mode 100644
index af4485ae6d2..00000000000
--- a/app/views/admin/books/index.html.slim
+++ /dev/null
@@ -1,27 +0,0 @@
-- title '書籍一覧'
-
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-            = link_to new_admin_book_path, class: 'a-button is-md is-secondary is-block' do
-              i.fas.fa-plus
-              | 書籍追加
-
-.page-tools
-  = render 'admin/admin_page_tabs'
-
-.page-body
-  .container.is-padding-horizontal-0-sm-down
-    = paginate @books
-    = render 'table', books: @books
-    = paginate @books
-    .form-actions
-      .form-actions__items
-        .form-actions__item.is-main
-          = link_to admin_books_qrcodes_path, class: 'card-main-actions_action a-button is-md is-secondary is-block', target: '_blank', rel: 'noopener' do
-            i.fas.fa-print
-            | 印刷ページ
diff --git a/app/views/admin/books/new.html.slim b/app/views/admin/books/new.html.slim
deleted file mode 100644
index ca14e44135d..00000000000
--- a/app/views/admin/books/new.html.slim
+++ /dev/null
@@ -1,18 +0,0 @@
-- title '書籍追加'
-
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-            = link_to admin_books_path, class: 'a-button is-md is-secondary is-block' do
-              | 書籍一覧
-
-.page-tools
-  = render 'admin/admin_page_tabs'
-
-.page-body
-  .container.is-md
-    = render 'form', book: @book
diff --git a/app/views/admin/books/qrcodes/index.html.slim b/app/views/admin/books/qrcodes/index.html.slim
deleted file mode 100644
index 0e6e7403ad2..00000000000
--- a/app/views/admin/books/qrcodes/index.html.slim
+++ /dev/null
@@ -1,15 +0,0 @@
-- @books.each_slice(Admin::Books::QrcodesController::DESPLAY_NUM) do |slice_book|
-  section class='sheet'
-    .book-stickers
-      - slice_book.each do |book|
-        .book-sticker
-          .book-sticker__logo
-            = image_tag 'pijord-book-logo.svg', class: 'book-sticker__logo-image'
-          .book-sticker__inner
-            .book-sticker__qrcode
-              = qrcode_tag book_url(book)
-            .book-sticker__id
-              .book-sticker__id-label BOOK ID
-              .book-sticker__id-body #{book.id}
-          .book-sticker__text
-            | オフィスから持ち出す際は、スマホでQRコードを読み取り貸出手続きしてください。
diff --git a/app/views/admin/books/qrcodes/show.html.slim b/app/views/admin/books/qrcodes/show.html.slim
deleted file mode 100644
index 0f8b59aab9b..00000000000
--- a/app/views/admin/books/qrcodes/show.html.slim
+++ /dev/null
@@ -1,11 +0,0 @@
-.book-sticker
-  .book-sticker__logo
-    = image_tag 'pijord-book-logo.svg', class: 'book-sticker__logo-image'
-  .book-sticker__inner
-    .book-sticker__qrcode
-      = qrcode_tag book_url(@book)
-    .book-sticker__id
-      .book-sticker__id-label BOOK ID
-      .book-sticker__id-body #{@book.id}
-  .book-sticker__text
-    | オフィスから持ち出す場合はこのQRコードから貸出手続きしてください。
diff --git a/app/views/admin/books/show.html.slim b/app/views/admin/books/show.html.slim
deleted file mode 100644
index 602c1e6de23..00000000000
--- a/app/views/admin/books/show.html.slim
+++ /dev/null
@@ -1,35 +0,0 @@
-- title @book.title
-
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = @book.title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-            = link_to admin_books_path, class: 'a-button is-md is-warning is-block is-back' do
-              | 書籍一覧
-
-.page-tools
-  = render 'admin/admin_page_tabs'
-
-.page-body
-  .container
-    article.thread
-      .thread__inner.a-card
-        header.thread-header
-          h1.thread-header-title
-            = @book.title
-          .thread-header__lower-side
-            .thread-header__lower-side-date
-              .thread-header__lower-side-label
-                | 登録日
-              time.thread-header__lower-side-value(datetime="#{@book.created_at.to_datetime}" pubdate='pubdate')
-                = l @book.created_at
-        footer.card-footer
-          .card-main-actions
-            p
-              = "書籍ID: #{@book.id}"
-            p
-              = link_to admin_books_qrcode_path(@book), target: '_blank', rel: 'noopener' do
-                | QRコードの印刷ページへ
diff --git a/app/views/admin/seats/_form.html.slim b/app/views/admin/seats/_form.html.slim
deleted file mode 100644
index 12d7a091f53..00000000000
--- a/app/views/admin/seats/_form.html.slim
+++ /dev/null
@@ -1,12 +0,0 @@
-= render 'errors', object: @seat
-= form_with model: [:admin, @seat], html: { name: 'seat', class: 'form' }, local: true do |f|
-  .form__items
-    .form-item
-      = f.label :name, class: 'a-form-label'
-      = f.text_field :name, class: 'a-text-input js-warning-form'
-  .form-actions
-    ul.form-actions__items
-      li.form-actions__item.is-main
-        = f.submit nil, class: 'a-button is-lg is-block is-warning'
-      li.form-actions__item.is-sub
-        = link_to 'キャンセル', admin_seats_path, class: 'a-button is-md is-block is-secondary'
diff --git a/app/views/admin/seats/_table.html.slim b/app/views/admin/seats/_table.html.slim
deleted file mode 100644
index 64a90f5d3bc..00000000000
--- a/app/views/admin/seats/_table.html.slim
+++ /dev/null
@@ -1,22 +0,0 @@
-.admin-table
-  table.admin-table__table
-    thead.admin-table__header
-      tr.admin-table__labels
-        th.admin-table__label = Seat.human_attribute_name :name
-        th.admin-table__label.actions 操作
-    tbody.admin-table__items
-      - seats.each do |seat|
-        tr.admin-table__item(id="seat_#{seat.id}")
-          td.admin-table__item-value
-            = seat.name
-          td.admin-table__item-value.is-text-align-center
-            ul.is-inline-buttons
-              li
-                = link_to edit_admin_seat_path(seat), class: 'a-button is-sm is-secondary is-icon' do
-                  i.fas.fa-pen
-              li
-                = link_to [:admin, seat],
-                  data: { confirm: '本当によろしいですか？' },
-                  method: :delete,
-                  class: 'a-button is-sm is-danger is-icon js-delete' do
-                  i.fas.fa-trash-alt
diff --git a/app/views/admin/seats/edit.html.slim b/app/views/admin/seats/edit.html.slim
deleted file mode 100644
index 4756d0e7b31..00000000000
--- a/app/views/admin/seats/edit.html.slim
+++ /dev/null
@@ -1,18 +0,0 @@
-- title '席一覧'
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-            = link_to new_admin_seat_path, class: 'a-button is-md is-secondary is-block' do
-              i.fas.fa-plus
-              | 席追加
-
-.page-tools
-  = render 'admin/admin_page_tabs'
-
-.page-body
-  .container.is-md
-    = render 'form'
diff --git a/app/views/admin/seats/index.html.slim b/app/views/admin/seats/index.html.slim
deleted file mode 100644
index 48dc5d282e7..00000000000
--- a/app/views/admin/seats/index.html.slim
+++ /dev/null
@@ -1,18 +0,0 @@
-- title '席一覧'
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-            = link_to new_admin_seat_path, class: 'a-button is-md is-warning is-block' do
-              i.fas.fa-plus
-              | 席追加
-
-.page-tools
-  = render 'admin/admin_page_tabs'
-
-.page-body
-  .container.is-padding-horizontal-0-sm-down
-    = render 'table', seats: @seats
diff --git a/app/views/admin/seats/new.html.slim b/app/views/admin/seats/new.html.slim
deleted file mode 100644
index 4756d0e7b31..00000000000
--- a/app/views/admin/seats/new.html.slim
+++ /dev/null
@@ -1,18 +0,0 @@
-- title '席一覧'
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-            = link_to new_admin_seat_path, class: 'a-button is-md is-secondary is-block' do
-              i.fas.fa-plus
-              | 席追加
-
-.page-tools
-  = render 'admin/admin_page_tabs'
-
-.page-body
-  .container.is-md
-    = render 'form'
diff --git a/app/views/api/events/_event.json.jbuilder b/app/views/api/events/_event.json.jbuilder
new file mode 100644
index 00000000000..56ac2c71877
--- /dev/null
+++ b/app/views/api/events/_event.json.jbuilder
@@ -0,0 +1,5 @@
+json.(event, :id, :title, :capacity, :wip, :start_at, :participants_count, :waitlist_count)
+json.start_at_localized l(event.start_at)
+json.comments_count event.comments.size
+json.url event_url(event)
+json.user event.user, partial: "api/users/user", as: :user
diff --git a/app/views/api/events/index.json.jbuilder b/app/views/api/events/index.json.jbuilder
new file mode 100644
index 00000000000..5c4d3c80953
--- /dev/null
+++ b/app/views/api/events/index.json.jbuilder
@@ -0,0 +1,2 @@
+json.events @events, partial: "api/events/event", as: :event
+json.total_pages @events.total_pages
diff --git a/app/views/api/products/_product.json.jbuilder b/app/views/api/products/_product.json.jbuilder
index 2a8115f3372..8d8e551593f 100644
--- a/app/views/api/products/_product.json.jbuilder
+++ b/app/views/api/products/_product.json.jbuilder
@@ -17,6 +17,16 @@ if product.updated_at.present?
   json.updated_at_date_time product.updated_at.to_datetime
 end
 
+if product.self_last_comment_at.present?
+  json.self_last_comment_at l(product.self_last_comment_at)
+  json.self_last_comment_at_date_time product.self_last_comment_at.to_datetime
+end
+
+if product.mentor_last_comment_at.present?
+  json.mentor_last_comment_at l(product.mentor_last_comment_at)
+  json.mentor_last_comment_at_date_time product.mentor_last_comment_at.to_datetime
+end
+
 json.user do
   json.partial! "api/users/user", user: product.user
 end
diff --git a/app/views/api/reservations/_reservation.json.jbuilder b/app/views/api/reservations/_reservation.json.jbuilder
deleted file mode 100644
index d67b7a49c7a..00000000000
--- a/app/views/api/reservations/_reservation.json.jbuilder
+++ /dev/null
@@ -1,3 +0,0 @@
-json.(reservation, :id, :seat_id, :user_id, :date)
-json.login_name reservation.user.login_name
-json.admin reservation.user.admin
diff --git a/app/views/api/reservations/create.json.jbuilder b/app/views/api/reservations/create.json.jbuilder
deleted file mode 100644
index d33e4c81cb8..00000000000
--- a/app/views/api/reservations/create.json.jbuilder
+++ /dev/null
@@ -1 +0,0 @@
-json.partial! "api/reservations/reservation", reservation: @reservation
diff --git a/app/views/api/reservations/index.json.jbuilder b/app/views/api/reservations/index.json.jbuilder
deleted file mode 100644
index de420dff41c..00000000000
--- a/app/views/api/reservations/index.json.jbuilder
+++ /dev/null
@@ -1,3 +0,0 @@
-json.array! @reservations do |reservation|
-  json.partial! "api/reservations/reservation", reservation: reservation  
-end
diff --git a/app/views/api/users/_list_user.json.jbuilder b/app/views/api/users/_list_user.json.jbuilder
index 76c554232f9..bfb1ee5798f 100644
--- a/app/views/api/users/_list_user.json.jbuilder
+++ b/app/views/api/users/_list_user.json.jbuilder
@@ -1,4 +1,4 @@
-json.(user, :id, :login_name, :name, :discord_account, :description, :github_account, :twitter_account, :facebook_url, :blog_url, :times_url, :job_seeker, :free, :job, :os, :experience, :email, :role, :icon_title,:cached_completed_percentage)
+json.(user, :id, :login_name, :name, :discord_account, :description, :github_account, :twitter_account, :facebook_url, :blog_url, :times_url, :job_seeker, :free, :job, :os, :experience, :email, :role, :icon_title, :cached_completed_percentage, :completed_fraction)
 json.tag_list user.tags.pluck(:name)
 json.url user_url(user)
 json.updated_at l(user.updated_at)
diff --git a/app/views/api/users/_user.json.jbuilder b/app/views/api/users/_user.json.jbuilder
index 513b84b539a..b2101d63d51 100644
--- a/app/views/api/users/_user.json.jbuilder
+++ b/app/views/api/users/_user.json.jbuilder
@@ -1,4 +1,4 @@
-columns = %i(id login_name url role icon_title)
+columns = %i(id login_name long_name url role icon_title)
 columns << :mentor_memo if admin_or_mentor_login?
 json.(user, *columns)
 json.avatar_url user.avatar_url
diff --git a/app/views/application/_mentor_menu.html.slim b/app/views/application/_mentor_menu.html.slim
index b3cf6e948ca..33666fdb44b 100644
--- a/app/views/application/_mentor_menu.html.slim
+++ b/app/views/application/_mentor_menu.html.slim
@@ -3,12 +3,12 @@
     | メンターメニュー
   ul.header-dropdown__items
     li.header-dropdown__item
-      = link_to 'https://app.redash.io/fjord-inc/public/dashboards/TR86ezvmxVWE7ScenS3yTE1z8lV4ILzvmOAyKmWY',
+      = link_to ENV['REDASH_DASHBOARD_URL'],
         class: 'header-dropdown__item-link',
         target: '_blank', rel: 'noopener' do
         | メンターダッシュボード
     li.header-dropdown__item
-      = link_to 'https://app.redash.io/fjord-inc/public/dashboards/WFwaaDZIgTFUan2BVhTK1axaxK1WaDSS0xOwSXHz',
+      = link_to ENV['REDASH_CHECK_COUNT_URL'],
         class: 'header-dropdown__item-link',
         target: '_blank', rel: 'noopener' do
         | 確認数の集計
diff --git a/app/views/application/_page_tab.html.slim b/app/views/application/_page_tab.html.slim
index 455c44ba1fa..89e9c9a4ade 100644
--- a/app/views/application/_page_tab.html.slim
+++ b/app/views/application/_page_tab.html.slim
@@ -1,3 +1,7 @@
 li.page-tabs__item
-  = link_to tab[:path], class: "page-tabs__item-link #{current_page_tab_or_not(tab[:target_name])}" do
-    = tab[:display_name]
+  - if tab[:display_name] == '質問'
+    = link_to tab[:path], class: "page-tabs__item-link #{current_page_tab_or_not(tab[:target_name])} #{@practice.questions.length.zero? ? 'is-inactive' : ''}" do
+      = tab[:display_name] + " （#{@practice.questions.length}）"
+  - else
+    = link_to tab[:path], class: "page-tabs__item-link #{current_page_tab_or_not(tab[:target_name])}" do
+      = tab[:display_name]
diff --git a/app/views/books/_form.html.slim b/app/views/books/_form.html.slim
deleted file mode 100644
index b47fc319163..00000000000
--- a/app/views/books/_form.html.slim
+++ /dev/null
@@ -1,9 +0,0 @@
-- if current_user.borrowing?(book)
-  = form_with url: book_borrowing_path(book), method: :delete, local: true do |f|
-    = f.submit '返却する', class: 'a-button is-md is-danger is-block'
-- elsif book.borrowed
-  span.a-button.is-md.is-danger.is-block
-    | 貸出中
-- else
-  = form_with url: book_borrowings_path(book), local: true do |f|
-    = f.submit '借りる', class: 'a-button is-md is-warning is-block'
diff --git a/app/views/books/_search_bar.html.slim b/app/views/books/_search_bar.html.slim
deleted file mode 100644
index 133a025e293..00000000000
--- a/app/views/books/_search_bar.html.slim
+++ /dev/null
@@ -1,7 +0,0 @@
-.page-tools
-  nav.page-search
-    .container
-      = form_tag search_results_path, method: 'get', class: 'page-search__form', name: 'book_search' do
-        = text_field_tag 'word', params[:word], class: 'a-xs-text-input page-search__text-input', placeholder: '書籍タイトルで検索'
-        button.a-button.is-sm.is-secondary.is-icon.page-search__submit#book-search(type='submit')
-          i.fas.fa-search
diff --git a/app/views/books/_table.html.slim b/app/views/books/_table.html.slim
deleted file mode 100644
index e1281741bc3..00000000000
--- a/app/views/books/_table.html.slim
+++ /dev/null
@@ -1,26 +0,0 @@
-.admin-table
-  table.admin-table__table
-    thead.admin-table__header
-      tr.admin-table__labels
-        th.admin-table__label = Book.human_attribute_name :id
-        th.admin-table__label = Book.human_attribute_name :title
-        th.admin-table__label = Book.human_attribute_name :isbn
-        th.admin-table__label 借りてる人
-        th.admin-table__label 借りてる日数
-    tbody.admin-table__items
-      - books.each do |book|
-        tr.admin-table__item(id="book_#{book.id}")
-          td.admin-table__item-value
-            = book.id
-          td.admin-table__item-value
-            = book.title
-          td.admin-table__item-value.is-text-align-center
-            = book.isbn
-          td.admin-table__item-value
-            - if book.borrowed
-              = image_tag book.borrowing_user_avatar, title: book.users.first.icon_title, class: 'admin-table__user-icon a-user-icon'
-              = link_to user_path(book.users.first), target: '_blank', rel: 'noopener' do
-                = book.borrowing_user_name
-          td.admin-table__item-value.is-text-align-center
-            - if book.borrowed
-              = "#{book.borrowing_days}日"
diff --git a/app/views/books/_tabs.html.slim b/app/views/books/_tabs.html.slim
deleted file mode 100644
index b38cbee95fd..00000000000
--- a/app/views/books/_tabs.html.slim
+++ /dev/null
@@ -1,8 +0,0 @@
-.page-tabs
-  .container
-    ul.page-tabs__items
-      li.page-tabs__item
-        = link_to '全ての書籍', books_path, class: "page-tabs__item-link #{current_link(/^books-index/)}"
-      li.page-tabs__item
-        = link_to borrowed_index_path, class: "page-tabs__item-link #{current_link(/^books-borrowed-index/)}" do
-          | 貸出中
diff --git a/app/views/books/borrowed/index.html.slim b/app/views/books/borrowed/index.html.slim
deleted file mode 100644
index e230ef74c27..00000000000
--- a/app/views/books/borrowed/index.html.slim
+++ /dev/null
@@ -1,19 +0,0 @@
-- title '貸出中の書籍一覧'
-
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-
-= render 'books/search_bar'
-
-= render 'books/tabs'
-
-.page-body
-  .container.is-padding-horizontal-0-sm-down
-    = paginate @books
-    = render 'books/table', books: @books
-    = paginate @books
diff --git a/app/views/books/index.html.slim b/app/views/books/index.html.slim
deleted file mode 100644
index 638fcb79e29..00000000000
--- a/app/views/books/index.html.slim
+++ /dev/null
@@ -1,23 +0,0 @@
-- title '書籍一覧'
-
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-
-= render 'books/search_bar'
-
-= render 'books/tabs'
-
-.page-body
-  .page-body__description
-    .container.is-md
-      p
-        | フィヨルドオフィスにて以下の書籍を借りることができます。
-  .container.is-padding-horizontal-0-sm-down
-    = paginate @books
-    = render 'table', books: @books
-    = paginate @books
diff --git a/app/views/books/search_results/index.html.slim b/app/views/books/search_results/index.html.slim
deleted file mode 100644
index 065052e613a..00000000000
--- a/app/views/books/search_results/index.html.slim
+++ /dev/null
@@ -1,17 +0,0 @@
-- title "'#{params[:word]}'の検索結果"
-
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-
-= render 'books/search_bar'
-
-.page-body
-  .container.is-padding-horizontal-0-sm-down
-    = paginate @search_results
-    = render 'books/table', books: @search_results if @search_results.any?
-    = paginate @search_results
diff --git a/app/views/books/show.html.slim b/app/views/books/show.html.slim
deleted file mode 100644
index c43fea994f4..00000000000
--- a/app/views/books/show.html.slim
+++ /dev/null
@@ -1,29 +0,0 @@
-- if current_user.borrowing?(@book)
-  - title '書籍の返却'
-- elsif @book.borrowed
-  - title '貸出中'
-- else
-  - title '書籍を借りる'
-
-header.page-header
-  .container
-    .page-header__inner
-      h1.page-header__title
-        = title
-
-.page-body
-  .container
-    article.thread.is-page
-      .thread__inner.a-card
-        header.thread-header
-          h1.thread-header-title
-            = @book.title
-          .thread-header__lower-side
-            .thread-header__lower-side-date
-              .thread-header__lower-side-label
-                | 登録日
-              time.thread-header__lower-side-value(datetime="#{@book.created_at.to_datetime}" pubdate='pubdate')
-                = l @book.created_at
-        footer.card-footer
-          .card-main-actions
-            = render 'form', book: @book
diff --git a/app/views/courses/practices/index.html.slim b/app/views/courses/practices/index.html.slim
index 75b39593c49..1e961927fb0 100644
--- a/app/views/courses/practices/index.html.slim
+++ b/app/views/courses/practices/index.html.slim
@@ -45,5 +45,5 @@ header.page-header
               | コース一覧
 
 .page-body.js-users-visibility
-  .container.is-lg
+  .container.is-xl
     #js-courses-practices(course-id="#{@course.id}")
diff --git a/app/views/events/_events.html.slim b/app/views/events/_events.html.slim
deleted file mode 100644
index fb925607035..00000000000
--- a/app/views/events/_events.html.slim
+++ /dev/null
@@ -1,47 +0,0 @@
-.thread-list-item(class="#{event.wip? ? 'is-wip' : ''}")
-  .thread-list-item__inner
-    .thread-list-item__author
-      = render 'users/icon',
-        user: event.user,
-        link_class: 'a-user-name',
-        image_class: 'thread-list-item__author-icon'
-    .thread-list-item__rows
-      .thread-list-item__row
-        .thread-list-item-title
-          - if event.wip?
-            .thread-list-item-title__icon.is-wip WIP
-          h2.thread-list-item-title__title(itemprop='name')
-            = link_to event, itemprop: 'url', class: 'thread-list-item-title__link' do
-              = event.title
-      .thread-list-item__row
-        .thread-list-item-name
-          = link_to event.user.long_name, event.user, class: 'a-user-name'
-      .thread-list-item__row
-        .thread-list-item-meta
-          .thread-list-item-meta__items
-            .thread-list-item-meta__item
-              time.a-meta(datetime=event.start_at.to_datetime)
-                span.a-meta__label
-                  | 開催日時
-                span.a-meta__value
-                  = l event.start_at
-            .thread-list-item-meta__item
-              .thread-list-item-comment
-                .thread-list-item-comment__label
-                  | 参加者
-                .thread-list-item-comment__count
-                  | （#{event.participants_count}名 / #{event.capacity}名）
-            - if event.waitlist_count.positive?
-              .thread-list-item-meta__item
-                .thread-list-item-comment
-                  .thread-list-item-comment__label
-                    | 補欠者
-                  .thread-list-item-comment__count
-                    | (#{event.waitlist_count}名)
-            - if event.comments.any?
-              .thread-list-item-meta__item
-                .thread-list-item-comment
-                  .thread-list-item-comment__label
-                    | コメント
-                  .thread-list-item-comment__count
-                    | （#{event.comments.size}）
diff --git a/app/views/events/index.html.slim b/app/views/events/index.html.slim
index 1ade306a4fe..64daa89f4ec 100644
--- a/app/views/events/index.html.slim
+++ b/app/views/events/index.html.slim
@@ -12,9 +12,4 @@ header.page-header
               i.fa.fa-plus
               | イベント作成
 
-.page-body
-  = paginate @events
-  .container.is-md
-    .thread-list.a-card
-      = render partial: 'events', collection: @events, as: :event
-= paginate @events
+#js-events
diff --git a/app/views/home/_my_seat_today.slim b/app/views/home/_my_seat_today.slim
deleted file mode 100644
index 9b6a54f6ed8..00000000000
--- a/app/views/home/_my_seat_today.slim
+++ /dev/null
@@ -1,4 +0,0 @@
-.o-page-info
-  .container
-    .o-page-info__body
-      p 今日は#{my_seat_today}席を予約しています
diff --git a/app/views/home/_reserved_seats_today.html.slim b/app/views/home/_reserved_seats_today.html.slim
deleted file mode 100644
index 4fd4811e3f8..00000000000
--- a/app/views/home/_reserved_seats_today.html.slim
+++ /dev/null
@@ -1,17 +0,0 @@
-.a-card.is-only-mentor
-  header.card-header.is-sm
-    h2.card-header__title 本日席を予約しているユーザー
-  - reservations.each do |reservation|
-    .thread-list-item
-      .thread-list-item__inner
-        .thread-list-item__author
-          = link_to reservation.user do
-            = image_tag reservation.user.avatar_url, class: "thread-list-item__author-icon a-user-icon is-#{reservation.user.role}"
-        header.thread-list-item-title
-          h2.thread-list-item-title__title(itemprop='name')
-            = link_to reservation.user, itemprop: 'url', class: 'thread-list-item-title__link' do
-              | #{reservation.user.name}（#{reservation.user.login_name}）
-        .thread-list-item-meta
-          .thread-list-item-meta__items
-            .thread-list-item-meta__item
-              | #{reservation.seat.name}席
diff --git a/app/views/home/index.html.slim b/app/views/home/index.html.slim
index 3058c3bb1ca..142bafcc486 100644
--- a/app/views/home/index.html.slim
+++ b/app/views/home/index.html.slim
@@ -8,8 +8,6 @@ header.page-header
 
 = render 'page_tabs', user: current_user
 
-- if @my_seat_today
-  = render 'my_seat_today', my_seat_today: @my_seat_today
 .page-body
   .container.is-xxl
     - if !Learning.find_by(user_id: current_user) && current_user.student_or_trainee?
@@ -40,9 +38,6 @@ header.page-header
         .col-xs-12.col-xl-6.col-xxl-6
           - if current_user.staff? && User.all.job_seeking.present?
             = render 'job_seeking_users', users: User.all.job_seeking
-          - if current_user.staff? && @reservations_for_today.present?
-            = render 'reserved_seats_today', reservations: @reservations_for_today
-          - unless current_user.total_learning_time.zero? || current_user.mentor?
             = render 'users/grass', user: current_user
           - if current_user.github_account.present?
             = render 'users/github_grass', user: current_user
@@ -54,5 +49,3 @@ header.page-header
             = render 'users/inactive_users', users: User.inactive_students_and_trainees
           - if current_user.role == :student
             = render 'required_field', user: current_user
-          - if current_user.books.present?
-            = render 'users/borrowing_books', user: current_user
diff --git a/app/views/notifications/_tabs.html.slim b/app/views/notifications/_tabs.html.slim
index b6863408735..79bdd0f8070 100644
--- a/app/views/notifications/_tabs.html.slim
+++ b/app/views/notifications/_tabs.html.slim
@@ -2,7 +2,7 @@
   .container
     ul.page-tabs__items
       li.page-tabs__item
-        = link_to '全て', notifications_path, class: "page-tabs__item-link #{current_link(/^notifications-index/)}"
-      li.page-tabs__item
-        = link_to unread_index_path, class: "page-tabs__item-link #{current_link(/^notifications-unread-index/)}" do
-          | 未読
+        = link_to t('notofication.all'), notifications_path(status: 'unread'), class: "page-tabs__item-link #{'is-active' if @target.nil?}".strip
+      - Notification::TARGETS_TO_KINDS.each_key do |target|
+        li.page-tabs__item
+          = link_to t("notification.#{target}"), notifications_path(status: 'unread', target: target), class: "page-tabs__item-link #{'is-active' if @target == target.to_s}".strip
diff --git a/app/views/notifications/index.html.slim b/app/views/notifications/index.html.slim
index 6c8c0286b6b..5e393b589d0 100644
--- a/app/views/notifications/index.html.slim
+++ b/app/views/notifications/index.html.slim
@@ -1,7 +1,7 @@
 - title '通知'
 
 header.page-header
-  .container
+  .container.is-md
     .page-header__inner
       h2.page-header__title
         = title
@@ -13,5 +13,14 @@ header.page-header
 
 = render 'notifications/tabs'
 
+.page-tools
+  nav.tab-nav.is-centered
+    .container.is-padding-horizontal-0-sm-down
+      ul.tab-nav__items
+        li.tab-nav__item
+          = link_to '未読', notifications_path(status: 'unread', target: @target), class: "tab-nav__item-link #{params[:status] == 'unread' ? 'is-active' : ''}"
+        li.tab-nav__item
+          = link_to '全て', notifications_path(target: @target), class: "tab-nav__item-link #{params[:status] == 'unread' ? '' : 'is-active'}"
+
 .page-body
-  #js-notifications(data-is-mentor="#{mentor_login?}")
+  #js-notifications(data-is-mentor="#{mentor_login?}" data-target="#{@target}")
diff --git a/app/views/notifications/unread/index.html.slim b/app/views/notifications/unread/index.html.slim
deleted file mode 100644
index 4e5435203e6..00000000000
--- a/app/views/notifications/unread/index.html.slim
+++ /dev/null
@@ -1,17 +0,0 @@
-- title '未読の通知'
-
-header.page-header
-  .container
-    .page-header__inner
-      h2.page-header__title
-        = title
-      .page-header-actions
-        .page-header-actions__items
-          .page-header-actions__item
-            = link_to allmarks_path, method: :post, class: "a-button is-md is-warning is-block #{current_user.notifications.unreads.empty? ? 'is-disabled' : ''}" do
-              | 全て既読にする
-
-= render 'notifications/tabs'
-
-.page-body
-  #js-notifications(data-is-mentor="#{mentor_login?}")
diff --git a/app/views/pages/index.html.slim b/app/views/pages/index.html.slim
index 0cf4f41b77f..9ab133c79d2 100644
--- a/app/views/pages/index.html.slim
+++ b/app/views/pages/index.html.slim
@@ -20,7 +20,7 @@ header.page-header
           = link_to pages_path, class: 'page-body__optional-title-cancel' do
             i.fas.fa-times.fa-fw
 .page-body
-  .container.is-lg
+  .container.is-xl
     = paginate @pages
     .two-columns
       .two-columns__inner
diff --git a/app/views/practices/reports/index.html.slim b/app/views/practices/reports/index.html.slim
index 780e7b884ee..50da1d23f4e 100644
--- a/app/views/practices/reports/index.html.slim
+++ b/app/views/practices/reports/index.html.slim
@@ -23,5 +23,8 @@ header.page-header
         = render partial: 'reports/report', collection: @reports, as: :report
       = paginate @reports
     - else
-      .a-empty-message
-        | 日報はまだありません。
+      .o-empty-message
+        .o-empty-message__icon
+          i.far.fa-sad-tear
+        .o-empty-message__text
+          | 日報はまだありません。
diff --git a/app/views/practices/show.html.slim b/app/views/practices/show.html.slim
index 34fd9f9abed..90717862d11 100644
--- a/app/views/practices/show.html.slim
+++ b/app/views/practices/show.html.slim
@@ -21,7 +21,7 @@ header.page-header
 = render 'page_tabs', resource: @practice
 
 .page-body
-  .container.is-xl
+  .container.is-lg
     .practice-contents
       .practice-contents__inner
         header.practice-contents__header
@@ -136,7 +136,7 @@ header.page-header
                 br
                 | 終了条件をクリアしたら完了にしてください。
 
-        - if current_user.mentor? || current_user.admin?
+        - if current_user.admin_or_mentor?
           section.a-card
             header.card-header
               h2.card-header__title
@@ -144,10 +144,9 @@ header.page-header
             .practice-content__body.is-memo
               .js-markdown-view.js-target-blank.is-long-text
                 = @practice.memo
-        - if current_user.admin?
           section.a-card
             header.card-header
-              h2.card-header__title 管理者メニュー
+              h2.card-header__title 管理者・メンター用メニュー
             footer.card-footer
               .card-main-actions
                 ul.card-main-actions__items
diff --git a/app/views/products/_report.html.slim b/app/views/products/_report.html.slim
index 2480b364a15..b5e05d5c78c 100644
--- a/app/views/products/_report.html.slim
+++ b/app/views/products/_report.html.slim
@@ -20,8 +20,8 @@
                 = l report.reported_on
                 = 'の日報'
       - if report.comments.any?
+        hr.thread-list-item__row-separator
         .thread-list-item__row
-          hr.thread-list-item__row-separator
           .thread-list-item-meta
             .thread-list-item-meta__items
               .thread-list-item-meta__item
diff --git a/app/views/products/show.html.slim b/app/views/products/show.html.slim
index 75cba5e195b..e51785e2155 100644
--- a/app/views/products/show.html.slim
+++ b/app/views/products/show.html.slim
@@ -49,7 +49,26 @@ header.page-header
                     .thread-header-metas__meta
                       = link_to @product.user, class: 'a-user-name' do
                         = @product.user.long_name
-
+                  .thread-header-metas__end
+                    .thread-header-metas__meta
+                      - length = @product.comments.length
+                      a.a-meta(href='#comments' class="#{length.zero? ? 'is-disabled' : ''}")
+                        | コメント（
+                        span(class="#{length.zero? ? 'is-muted' : 'is-emphasized'}")
+                          = length
+                        | ）
+              .thread-header__row
+                h1.thread-header-title(class="#{@product.wip? ? 'is-wip' : ''}")
+                  - if @product.wip?
+                    span.thread-header-title__label
+                      | WIP
+                  span.thread-header-title__title
+                    - if @product.user.daimyo?
+                      | ★
+                    | #{link_to @product.practice.title, @product.practice, class: 'thread-header-title__link'}の提出物
+              .thread-header__row
+                .thread-header-metas
+                  .thread-header-metas__start
                     .thread-header-metas__meta
                       .a-meta
                         - if @product.wip?
@@ -74,24 +93,6 @@ header.page-header
                           time.a-meta__value(datetime="#{@product.updated_at.to_datetime}")
                             = l @product.updated_at
 
-                    .thread-header-metas__meta
-                      - length = @product.comments.length
-                      a.a-meta(href='#comments' class="#{length.zero? ? 'is-disabled' : ''}")
-                        | コメント（
-                        span(class="#{length.zero? ? 'is-muted' : 'is-emphasized'}")
-                          = length
-                        | ）
-
-              .thread-header__row
-                h1.thread-header-title(class="#{@product.wip? ? 'is-wip' : ''}")
-                  - if @product.wip?
-                    span.thread-header-title__label
-                      | WIP
-                  span.thread-header-title__title
-                    - if @product.user.daimyo?
-                      | ★
-                    | #{link_to @product.practice.title, @product.practice, class: 'thread-header-title__link'}の提出物
-
               .thread-header__row
                 .thread-header-actions
                   .thread-header-actions__start
diff --git a/app/views/reports/_report.html.slim b/app/views/reports/_report.html.slim
index 0068b67e52c..00bfc9563c3 100644
--- a/app/views/reports/_report.html.slim
+++ b/app/views/reports/_report.html.slim
@@ -39,8 +39,8 @@
                 = l report.reported_on
                 = 'の日報'
       - if report.comments.any?
+        hr.thread-list-item__row-separator
         .thread-list-item__row
-          hr.thread-list-item__row-separator
           .thread-list-item-meta
             .thread-list-item-meta__items
               .thread-list-item-meta__item
diff --git a/app/views/reservation_calenders/show.html.slim b/app/views/reservation_calenders/show.html.slim
deleted file mode 100644
index 9726f0398f3..00000000000
--- a/app/views/reservation_calenders/show.html.slim
+++ /dev/null
@@ -1,33 +0,0 @@
-- title '席予約一覧'
-- content_for(:extra_body_classes, 'no-recent-reports')
-
-header.page-header
-  .container
-    .page-header__inner
-      h2.page-header__title
-        = title
-
-.page-body
-  .container
-    .calender
-      header.calender-header
-        .calender-header__inner
-          .calender-header__nav
-            = link_to reservation_calender_path(l(@prev_month, format: :ym)), id: 'previous-month', class: 'a-button is-md is-secondary is-icon is-block' do
-              i.fas.fa-angle-left
-          h2.calender-header__title
-            = l(@this_month, format: :ym_jp)
-          .calender-header__nav
-            = link_to reservation_calender_path(l(@next_month, format: :ym)), id: 'next-month', class: 'a-button is-md is-secondary is-icon is-block' do
-              i.fas.fa-angle-right
-      .calender__body
-        #js-reservations(data-reservations-beggining-of-this-month="#{@this_month}" data-reservations-end-of-this-month="#{@this_month.end_of_month}" data-current-user-id="#{current_user.id}")
-          #js-reservations-data-holiday-jps
-            = @holidays.to_json
-          #js-memos-data
-            = @memos.to_json
-          #js-seats-data
-            = @seats.to_json
-          - if staff_login?
-            #js-admin-login
-              = '1'
diff --git a/app/views/users/_borrowing_books.html.slim b/app/views/users/_borrowing_books.html.slim
deleted file mode 100644
index dd5c63a30aa..00000000000
--- a/app/views/users/_borrowing_books.html.slim
+++ /dev/null
@@ -1,10 +0,0 @@
-.a-card
-  .card-header.is-sm
-    h2.card-header__title
-      | 借りている書籍
-  .card-list
-    .card-list__items
-      - user.books.each do |book|
-        .card-list__item
-          .card-list__item-link
-            = "「#{book.title}」を#{book.borrowing_days}日間借りています。"
diff --git a/app/views/users/practices/_completed_practices_progress.html.slim b/app/views/users/practices/_completed_practices_progress.html.slim
index 26a04f7f7b2..297945a7546 100644
--- a/app/views/users/practices/_completed_practices_progress.html.slim
+++ b/app/views/users/practices/_completed_practices_progress.html.slim
@@ -1,7 +1,8 @@
 - percentage = user.cached_completed_percentage
+- fraction = user.completed_fraction
 .completed-practices-progress
   .completed-practices-progress__bar-container
     .completed-practices-progress__bar
     .completed-practices-progress__percentage-bar(aria-valuemax='100' aria-valuemin='0' aria-valuenow="#{percentage}" role='progressbar' style="width: #{number_to_percentage percentage, precision: 0};")
-  .completed-practices-progress__percentage-number
-    = number_to_percentage percentage, precision: 0
+  .completed-practices-progress__number
+    = fraction
diff --git a/app/views/users/show.html.slim b/app/views/users/show.html.slim
index c8750301067..74b7f3909ab 100644
--- a/app/views/users/show.html.slim
+++ b/app/views/users/show.html.slim
@@ -82,7 +82,5 @@ header.page-header
           - if @user.completed_practices.present?
             - cache [@user, @completed_learnings] do
               = render '/users/practices/completed_practices', user: @user, completed_learnings: @completed_learnings
-          - if @user.books.present?
-            = render '/users/borrowing_books', user: @user
 
         .col-xs-12.col-lg-5.col-xxl-6
diff --git a/config/locales/ja.yml b/config/locales/ja.yml
index d16ad424cfd..a31de344950 100644
--- a/config/locales/ja.yml
+++ b/config/locales/ja.yml
@@ -31,10 +31,7 @@ ja:
       announcement: お知らせ
       article: ブログ記事
       work: 作品
-      book: 書籍
       event: イベント
-      reservation: 席予約
-      seat: 席
       memo: メモ
       reference_book: 参考書籍
     attributes:
@@ -124,12 +121,6 @@ ja:
         learning_times: 学習時間
         emotion: 今日の気分
         no_learn: 学習時間は無し
-      reservation:
-        date: 日付
-        user_id: ユーザー
-        seat_id: 席
-      seat:
-        name: 名前
       memo:
         body: 内容
         date: 日付
@@ -169,10 +160,6 @@ ja:
         repository: リポジトリURL
         url_or_repository: URLまたはリポジトリ
         thumbnail: サムネイル画像
-      book:
-        id: ID
-        title: タイトル
-        isbn: ISBN-13
       event:
         title: タイトル
         description: 詳細
@@ -261,3 +248,11 @@ ja:
         cost: 受講料が高いから
         job_change: 転職や引っ越しなど環境の変化によって学びが継続できなくなったから
         training_end: 企業研修で利用をしていて研修期間が終了したため
+  notification:
+    all: 全て
+    announcement: お知らせ
+    mention: メンション
+    comment: コメント
+    check: 提出物の確認
+    watching: Watch中
+    following_report: フォロー中
diff --git a/config/routes.rb b/config/routes.rb
index f8b73849603..d9549e868ec 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -29,11 +29,7 @@
     resources :courses_categories, only: %i() do
       resource :position, only: %i(update), controller: "courses_categories/position"
     end
-    resources :notifications, only: %i(index) do
-      collection do
-        resources :unread, only: %i(index), controller: "/api/notifications/unread"
-      end
-    end
+    resources :notifications, only: %i(index)
     resources :comments, only: %i(index create update destroy)
     resources :answers, only: %i(index create update destroy) do
       resource :correct_answer, only: %i(create update)
@@ -45,7 +41,6 @@
     resources :users, only: %i(index show update)
     resources :user_icon_urls, only: %i(index)
     get "users/tags/:tag", to: "users#index", as: :users_tag, tag: /.+/
-    resources :reservations, only: %i(index create destroy)
     resources :practices, only: %i(index show update) do
       resource :learning, only: %i(show update), controller: "practices/learning"
     end
@@ -80,6 +75,7 @@
     resources :searchables, only: %i(index)
     resources :niconico_calendars, only: %i(show)
     resources :bookmarks, only: %i(index create destroy)
+    resources :events, only: %i(index)
   end
 
   namespace :admin do
@@ -90,11 +86,6 @@
     end
     resources :categories, except: %i(show)
     resources :courses, only: %i(index)
-    namespace :books do
-      resources :qrcodes, only: %i(index show)
-    end
-    resources :books
-    resources :seats, except: %i(show)
   end
 
   namespace :current_user do
@@ -165,20 +156,12 @@
   resources :notifications, only: %i(index show) do
     collection do
       resources :allmarks, only: %i(create), controller: "notifications/allmarks"
-      resources :unread, only: %i(index), controller: "notifications/unread", path: :unread
     end
   end
   resources :works, except: %i(index)
-  resources :books, only: %i(index show) do
-    resources :borrowings, only: %i(create destroy)
-    collection do
-      resources :borrowed, only: %i(index), controller: "books/borrowed", path: :borrowed
-      resources :search_results, only: %i(index), controller: "books/search_results"
-    end
-  end
 
   resources :questions, only: %i(index show new create destroy)
-  resources :reservation_calenders, only: %i(index show)
+  resources :courses, only: :index
 
   resource :inquiry, only: %i(new create)
 
diff --git a/db/data/20210816082555_add_last_comment_at.rb b/db/data/20210816082555_add_last_comment_at.rb
new file mode 100644
index 00000000000..4133ae3d0b3
--- /dev/null
+++ b/db/data/20210816082555_add_last_comment_at.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class AddLastCommentAt < ActiveRecord::Migration[6.1]
+  def up
+    products = Product.where(self_last_comment_at: nil).where(mentor_last_comment_at: nil)
+    products.each do |product|
+      next unless product.comments.size.positive?
+
+      product.comments.each do |comment|
+        if comment.user.mentor
+          product.mentor_last_comment_at = comment.updated_at
+        elsif comment.user == product.user
+          product.self_last_comment_at = comment.updated_at
+        end
+      end
+      product.save!
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end
diff --git a/db/fixtures/books.yml b/db/fixtures/books.yml
deleted file mode 100644
index a0e9df864d9..00000000000
--- a/db/fixtures/books.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-book1:
-  title: ゼロからわかる Ruby 超入門
-  isbn: 978-4297101237
-  borrowed: true
-
-book2:
-  title: ゼロからわかる Ruby 超入門
-  isbn: 978-4297101237
-  borrowed: false
-
-book3:
-  title: 現場で使える Ruby on Rails 5速習実践ガイド
-  isbn: 978-4839962227
-  borrowed: true
-
-book4:
-  title: 現場で使える Ruby on Rails 5速習実践ガイド
-  isbn: 978-4839962227
-  borrowed: false
diff --git a/db/fixtures/borrowings.yml b/db/fixtures/borrowings.yml
deleted file mode 100644
index 1944b1bc308..00000000000
--- a/db/fixtures/borrowings.yml
+++ /dev/null
@@ -1,9 +0,0 @@
-borrowing1:
-  user: hajime
-  book: book1
-  created_at: <%= Time.current.ago(3.days).strftime("%Y-%m-%d") %>
-
-borrowing2:
-  user: yamada
-  book: book3
-  created_at: <%= Time.current.ago(7.days).strftime("%Y-%m-%d") %>
diff --git a/db/fixtures/events.yml b/db/fixtures/events.yml
index ea18611119e..11c2bcd0833 100644
--- a/db/fixtures/events.yml
+++ b/db/fixtures/events.yml
@@ -65,3 +65,40 @@ event6:
   open_start_at: 2019-12-10 9:00
   open_end_at: 2019-12-16 9:00
   user: komagata
+
+event7:
+  title: "テストのイベント"
+  description: "テストのイベントです。"
+  location: "FJORDオフィス"
+  capacity: 10
+  start_at: 2019-12-17 10:00:00
+  end_at: 2019-12-17 12:00:00
+  open_start_at: 2019-12-10 9:00
+  open_end_at: 2019-12-16 9:00
+  user: komagata
+
+event8:
+  title: "イベントの検索結果テスト用"
+  description: "イベントの検索結果テスト用"
+  location: "FJORDオフィス"
+  capacity: 10
+  start_at: 2018-5-20 10:00:00
+  end_at: 2018-5-20 12:00:00
+  open_start_at: 2018-5-14 9:00
+  open_end_at: 2018-5-20 9:00
+  user: komagata
+
+<% (9..26).each do |i| %>
+event<%= i %>:
+  title: "イベント<%= i %>"
+  description: "<%= i %>番目のイベントです。"
+  location: "FJORDオフィス"
+  capacity: 10
+  start_at: <%= Time.zone.local(2018, 5, 20, 10).ago(i.days) %>
+  end_at: <%= Time.zone.local(2018, 5, 20, 12).ago(i.days) %>
+  open_start_at: <%= Time.zone.local(2018, 5, 14, 9).ago(i.days) %>
+  open_end_at: <%= Time.zone.local(2018, 5, 20, 9).ago(i.days) %>
+  created_at: <%= Time.zone.local(2018, 5, 14, 9).ago(i.days) %>
+  updated_at: <%= Time.zone.local(2018, 5, 14, 9).ago(i.days) %>
+  user: komagata
+<% end %>
diff --git a/db/fixtures/reservations.yml b/db/fixtures/reservations.yml
deleted file mode 100644
index 39dc7502613..00000000000
--- a/db/fixtures/reservations.yml
+++ /dev/null
@@ -1,29 +0,0 @@
-reservation1:
-  date: 2019-11-21
-  seat: seat1
-  user: komagata
-
-reservation2:
-  date: 2019-11-09
-  seat: seat2
-  user: machida
-
-reservation3:
-  date: 2019-11-10
-  seat: seat3
-  user: machida
-
-reservation4:
-  date: 2019-11-03
-  seat: seat4
-  user: hatsuno
-
-reservation5:
-  date: <%= Date.current %>
-  seat: seat5
-  user: kimura
-
-reservation6:
-  date: <%= Date.current %>
-  seat: seat6
-  user: hajime
diff --git a/db/fixtures/seats.yml b/db/fixtures/seats.yml
deleted file mode 100644
index c6dd6d2c5fc..00000000000
--- a/db/fixtures/seats.yml
+++ /dev/null
@@ -1,47 +0,0 @@
-seat1:
-  name: A
-
-seat2:
-  name: B
-
-seat3:
-  name: C
-
-seat4:
-  name: D
-
-seat5:
-  name: E
-
-seat6:
-  name: F
-
-seat7:
-  name: G
-
-seat8:
-  name: H
-
-seat9:
-  name: I
-
-seat10:
-  name: J
-
-seat11:
-  name: K
-
-seat12:
-  name: L
-
-seat13:
-  name: ソファ1
-
-seat14:
-  name: ソファ2
-
-seat15:
-  name: ソファ3
-
-seat16:
-  name: ソファ4
diff --git a/db/migrate/20210805061849_add_self_last_comment_at_column_and_mentor_last_comment_at_column_to_products.rb b/db/migrate/20210805061849_add_self_last_comment_at_column_and_mentor_last_comment_at_column_to_products.rb
new file mode 100644
index 00000000000..bb189150783
--- /dev/null
+++ b/db/migrate/20210805061849_add_self_last_comment_at_column_and_mentor_last_comment_at_column_to_products.rb
@@ -0,0 +1,7 @@
+class AddSelfLastCommentAtColumnAndMentorLastCommentAtColumnToProducts < ActiveRecord::Migration[6.1]
+  def change
+    add_column :products, :self_last_comment_at, :datetime
+
+    add_column :products, :mentor_last_comment_at, :datetime
+  end
+end
diff --git a/db/migrate/20210822083758_drop_borrowings.rb b/db/migrate/20210822083758_drop_borrowings.rb
new file mode 100644
index 00000000000..b6f052c0304
--- /dev/null
+++ b/db/migrate/20210822083758_drop_borrowings.rb
@@ -0,0 +1,10 @@
+class DropBorrowings < ActiveRecord::Migration[6.1]
+  def change
+    drop_table :borrowings do |t|
+      t.bigint :user_id
+      t.bigint :book_id
+      t.datetime :created_at, null: false
+      t.datetime :updated_at, null: false
+    end
+  end
+end
diff --git a/db/migrate/20210822092508_drop_books.rb b/db/migrate/20210822092508_drop_books.rb
new file mode 100644
index 00000000000..8998882eab5
--- /dev/null
+++ b/db/migrate/20210822092508_drop_books.rb
@@ -0,0 +1,11 @@
+class DropBooks < ActiveRecord::Migration[6.1]
+  def change
+    drop_table :books do |t|
+      t.string :title, null: false
+      t.string :isbn, null: false
+      t.boolean :borrowed, default: false, null: false
+      t.datetime :created_at, null: false
+      t.datetime :updated_at, null: false
+    end
+  end
+end
diff --git a/db/migrate/20210828144913_drop_reservations.rb b/db/migrate/20210828144913_drop_reservations.rb
new file mode 100644
index 00000000000..c47b3f4a755
--- /dev/null
+++ b/db/migrate/20210828144913_drop_reservations.rb
@@ -0,0 +1,11 @@
+class DropReservations < ActiveRecord::Migration[6.1]
+  def change
+    drop_table :reservations do |t|
+      t.date :date
+      t.integer :user_id, null: false, foreign_key: true
+      t.integer :seat_id, null: false, foreign_key: true
+      t.index :reservations, %i[seat_id date], unique: true
+      t.timestamps
+    end
+  end
+end
diff --git a/db/migrate/20210828145120_drop_seats.rb b/db/migrate/20210828145120_drop_seats.rb
new file mode 100644
index 00000000000..707e72d64a4
--- /dev/null
+++ b/db/migrate/20210828145120_drop_seats.rb
@@ -0,0 +1,8 @@
+class DropSeats < ActiveRecord::Migration[6.1]
+  def change
+    drop_table :seats do |t|
+      t.string :name
+      t.timestamps
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index ab0e9fd3dc3..810e6a4452f 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_08_27_042336) do
+ActiveRecord::Schema.define(version: 2021_08_28_145120) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -85,23 +85,6 @@
     t.index ["bookmarkable_type", "bookmarkable_id"], name: "index_bookmarks_on_bookmarkable"
   end
 
-  create_table "books", force: :cascade do |t|
-    t.string "title", null: false
-    t.string "isbn", null: false
-    t.boolean "borrowed", default: false, null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-  end
-
-  create_table "borrowings", force: :cascade do |t|
-    t.bigint "user_id"
-    t.bigint "book_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["book_id"], name: "index_borrowings_on_book_id"
-    t.index ["user_id"], name: "index_borrowings_on_user_id"
-  end
-
   create_table "categories", id: :serial, force: :cascade do |t|
     t.string "name"
     t.string "slug"
@@ -326,6 +309,8 @@
     t.boolean "wip", default: false, null: false
     t.datetime "published_at"
     t.bigint "checker_id"
+    t.datetime "self_last_comment_at"
+    t.datetime "mentor_last_comment_at"
     t.index ["practice_id"], name: "index_products_on_practice_id"
     t.index ["user_id", "practice_id"], name: "index_products_on_user_id_and_practice_id", unique: true
     t.index ["user_id"], name: "index_products_on_user_id"
@@ -380,21 +365,6 @@
     t.index ["user_id", "title"], name: "index_reports_on_user_id_and_title", unique: true
   end
 
-  create_table "reservations", force: :cascade do |t|
-    t.date "date"
-    t.integer "user_id", null: false
-    t.integer "seat_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["seat_id", "date"], name: "index_reservations_on_seat_id_and_date", unique: true
-  end
-
-  create_table "seats", force: :cascade do |t|
-    t.string "name"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-  end
-
   create_table "taggings", id: :serial, force: :cascade do |t|
     t.integer "tag_id"
     t.string "taggable_type"
@@ -503,8 +473,6 @@
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
   add_foreign_key "announcements", "users"
   add_foreign_key "articles", "users"
-  add_foreign_key "borrowings", "books"
-  add_foreign_key "borrowings", "users"
   add_foreign_key "categories_practices", "categories"
   add_foreign_key "categories_practices", "practices"
   add_foreign_key "images", "users"
diff --git a/db/seeds.rb b/db/seeds.rb
index bcc699ad650..8d6585c481f 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -10,8 +10,6 @@
   answers
   articles
   bookmarks
-  books
-  borrowings
   categories
   checks
   comments
@@ -33,8 +31,6 @@
   products
   questions
   reactions
-  reservations
-  seats
   watches
   works
 ]
diff --git a/test/fixtures/books.yml b/test/fixtures/books.yml
deleted file mode 100644
index a0e9df864d9..00000000000
--- a/test/fixtures/books.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-book1:
-  title: ゼロからわかる Ruby 超入門
-  isbn: 978-4297101237
-  borrowed: true
-
-book2:
-  title: ゼロからわかる Ruby 超入門
-  isbn: 978-4297101237
-  borrowed: false
-
-book3:
-  title: 現場で使える Ruby on Rails 5速習実践ガイド
-  isbn: 978-4839962227
-  borrowed: true
-
-book4:
-  title: 現場で使える Ruby on Rails 5速習実践ガイド
-  isbn: 978-4839962227
-  borrowed: false
diff --git a/test/fixtures/borrowings.yml b/test/fixtures/borrowings.yml
deleted file mode 100644
index 1944b1bc308..00000000000
--- a/test/fixtures/borrowings.yml
+++ /dev/null
@@ -1,9 +0,0 @@
-borrowing1:
-  user: hajime
-  book: book1
-  created_at: <%= Time.current.ago(3.days).strftime("%Y-%m-%d") %>
-
-borrowing2:
-  user: yamada
-  book: book3
-  created_at: <%= Time.current.ago(7.days).strftime("%Y-%m-%d") %>
diff --git a/test/fixtures/events.yml b/test/fixtures/events.yml
index 0647b9bea0d..11c2bcd0833 100644
--- a/test/fixtures/events.yml
+++ b/test/fixtures/events.yml
@@ -87,3 +87,18 @@ event8:
   open_start_at: 2018-5-14 9:00
   open_end_at: 2018-5-20 9:00
   user: komagata
+
+<% (9..26).each do |i| %>
+event<%= i %>:
+  title: "イベント<%= i %>"
+  description: "<%= i %>番目のイベントです。"
+  location: "FJORDオフィス"
+  capacity: 10
+  start_at: <%= Time.zone.local(2018, 5, 20, 10).ago(i.days) %>
+  end_at: <%= Time.zone.local(2018, 5, 20, 12).ago(i.days) %>
+  open_start_at: <%= Time.zone.local(2018, 5, 14, 9).ago(i.days) %>
+  open_end_at: <%= Time.zone.local(2018, 5, 20, 9).ago(i.days) %>
+  created_at: <%= Time.zone.local(2018, 5, 14, 9).ago(i.days) %>
+  updated_at: <%= Time.zone.local(2018, 5, 14, 9).ago(i.days) %>
+  user: komagata
+<% end %>
diff --git a/test/fixtures/reservations.yml b/test/fixtures/reservations.yml
deleted file mode 100644
index 39dc7502613..00000000000
--- a/test/fixtures/reservations.yml
+++ /dev/null
@@ -1,29 +0,0 @@
-reservation1:
-  date: 2019-11-21
-  seat: seat1
-  user: komagata
-
-reservation2:
-  date: 2019-11-09
-  seat: seat2
-  user: machida
-
-reservation3:
-  date: 2019-11-10
-  seat: seat3
-  user: machida
-
-reservation4:
-  date: 2019-11-03
-  seat: seat4
-  user: hatsuno
-
-reservation5:
-  date: <%= Date.current %>
-  seat: seat5
-  user: kimura
-
-reservation6:
-  date: <%= Date.current %>
-  seat: seat6
-  user: hajime
diff --git a/test/fixtures/seats.yml b/test/fixtures/seats.yml
deleted file mode 100644
index c6dd6d2c5fc..00000000000
--- a/test/fixtures/seats.yml
+++ /dev/null
@@ -1,47 +0,0 @@
-seat1:
-  name: A
-
-seat2:
-  name: B
-
-seat3:
-  name: C
-
-seat4:
-  name: D
-
-seat5:
-  name: E
-
-seat6:
-  name: F
-
-seat7:
-  name: G
-
-seat8:
-  name: H
-
-seat9:
-  name: I
-
-seat10:
-  name: J
-
-seat11:
-  name: K
-
-seat12:
-  name: L
-
-seat13:
-  name: ソファ1
-
-seat14:
-  name: ソファ2
-
-seat15:
-  name: ソファ3
-
-seat16:
-  name: ソファ4
diff --git a/test/integration/api/events_test.rb b/test/integration/api/events_test.rb
new file mode 100644
index 00000000000..a9ed814fa97
--- /dev/null
+++ b/test/integration/api/events_test.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class API::EventsTest < ActionDispatch::IntegrationTest
+  test 'GET /api/events.json' do
+    get api_events_path(format: :json)
+    assert_response :unauthorized
+
+    token = create_token('kimura', 'testtest')
+    get api_events_path(format: :json),
+        headers: { 'Authorization' => "Bearer #{token}" }
+    assert_response :ok
+  end
+end
diff --git a/test/integration/api/notifications_test.rb b/test/integration/api/notifications_test.rb
index dedc153a5d1..98d2bc9b148 100644
--- a/test/integration/api/notifications_test.rb
+++ b/test/integration/api/notifications_test.rb
@@ -13,12 +13,12 @@ class API::NotificationsTest < ActionDispatch::IntegrationTest
     assert_response :ok
   end
 
-  test 'GET /api/notifications/unread.json' do
-    get api_unread_index_path(format: :json)
+  test 'GET /api/notifications.json?status=unread' do
+    get api_notifications_path(status: 'unread', format: :json)
     assert_response :unauthorized
 
     token = create_token('hatsuno', 'testtest')
-    get api_unread_index_path(format: :json),
+    get api_notifications_path(status: 'unread', format: :json),
         headers: { 'Authorization' => "Bearer #{token}" }
     assert_response :ok
   end
diff --git a/test/models/user_test.rb b/test/models/user_test.rb
index 329d4afc798..f2d7a6bddd6 100644
--- a/test/models/user_test.rb
+++ b/test/models/user_test.rb
@@ -86,11 +86,37 @@ class UserTest < ActiveSupport::TestCase
     assert_not_equal old_percentage, user.completed_percentage
 
     old_percentage = user.completed_percentage
-    user.completed_practices << practices(:practice52)
+    user.completed_practices << practices(:practice55)
 
     assert_equal old_percentage, user.completed_percentage
   end
 
+  test '#completed_fraction don\'t calculate practice that include_progress: false' do
+    user = users(:komagata)
+    old_fraction = user.completed_fraction
+    user.completed_practices << practices(:practice5)
+
+    assert_not_equal old_fraction, user.completed_fraction
+
+    old_fraction = user.completed_fraction
+    user.completed_practices << practices(:practice53)
+
+    assert_equal old_fraction, user.completed_fraction
+  end
+
+  test '#completed_fraction don\'t calculate practice unrelated cource' do
+    user = users(:komagata)
+    old_fraction = user.completed_fraction
+    user.completed_practices << practices(:practice5)
+
+    assert_not_equal old_fraction, user.completed_fraction
+
+    old_fraction = user.completed_fraction
+    user.completed_practices << practices(:practice55)
+
+    assert_equal old_fraction, user.completed_fraction
+  end
+
   test '#depressed?' do
     user = users(:kimura)
     2.times do |i|
diff --git a/test/supports/notification_helper.rb b/test/supports/notification_helper.rb
index 18192d8d428..40ba4a9c804 100644
--- a/test/supports/notification_helper.rb
+++ b/test/supports/notification_helper.rb
@@ -19,7 +19,7 @@ def notification_messages
   # open_notificationを実行した(右上のベルボタンを押した)かで
   # 戻り値が変更されるため、これを作成
   def exists_unread_notification?(message)
-    visit unread_index_path
+    visit notifications_path(status: 'unread')
     wait_for_vuejs # 通知一覧はVueでREST APIを利用して表示しているため
     exists = page.has_selector?('span.thread-list-item-title__link-label',
                                 text: message)
@@ -28,7 +28,7 @@ def exists_unread_notification?(message)
   end
 
   def link_to_page_by_unread_notification(message)
-    visit unread_index_path
+    visit notifications_path(status: 'unread')
     wait_for_vuejs # 通知一覧はVueでREST APIを利用して表示しているため
     click_link message, class: 'thread-list-item-title__link'
   end
diff --git a/test/system/admin/books/qrcodes_test.rb b/test/system/admin/books/qrcodes_test.rb
deleted file mode 100644
index f024bbaa0ab..00000000000
--- a/test/system/admin/books/qrcodes_test.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-require 'application_system_test_case'
-
-class Admin::Books::QrcodesTest < ApplicationSystemTestCase
-  test 'show qrcodes' do
-    visit_with_auth '/admin/books/qrcodes', 'komagata'
-    assert_text books(:book1).id.to_s
-  end
-
-  test 'show qrcode' do
-    book = books(:book1)
-    visit_with_auth "/admin/books/qrcodes/#{book.id}", 'komagata'
-    assert_text book.id.to_s
-  end
-end
diff --git a/test/system/admin/seats_test.rb b/test/system/admin/seats_test.rb
deleted file mode 100644
index f41f4d5313e..00000000000
--- a/test/system/admin/seats_test.rb
+++ /dev/null
@@ -1,41 +0,0 @@
-# frozen_string_literal: true
-
-require 'application_system_test_case'
-
-class Admin::SeatsTest < ApplicationSystemTestCase
-  test 'show seats' do
-    visit_with_auth '/admin/seats', 'komagata'
-    assert_equal '席一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-  end
-
-  test 'create seat' do
-    visit_with_auth '/admin/seats/new', 'komagata'
-    assert_equal '席一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-    within 'form[name=seat]' do
-      fill_in 'seat[name]', with: 'Z'
-      click_button '登録する'
-    end
-    assert_text '席を作成しました。'
-  end
-
-  test 'update seat' do
-    visit_with_auth "/admin/seats/#{seats(:seat1).id}/edit", 'komagata'
-    assert_equal '席一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-    within 'form[name=seat]' do
-      fill_in 'seat[name]', with: 'Z'
-      click_button '更新する'
-    end
-    assert_text '席を更新しました。'
-  end
-
-  test 'delete seat' do
-    visit_with_auth '/admin/seats', 'komagata'
-    assert_equal '席一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-    accept_confirm do
-      find("#seat_#{seats(:seat1).id} .js-delete").click
-    end
-    assert_text '席を削除しました。'
-  end
-end
diff --git a/test/system/answers_test.rb b/test/system/answers_test.rb
index cd7322e994c..bc9a9ece87e 100644
--- a/test/system/answers_test.rb
+++ b/test/system/answers_test.rb
@@ -81,15 +81,15 @@ class AnswersTest < ApplicationSystemTestCase
     end
 
     # Watcherに通知される
-    visit_with_auth '/notifications/unread', 'kimura'
+    visit_with_auth '/notifications?status=unread', 'kimura'
     assert_text 'sotugyouさんの質問【 injectとreduce 】でkomagataさんの回答がベストアンサーに選ばれました。'
 
     # Watchしていない回答者には通知されない
-    visit_with_auth '/notifications/unread', 'komagata'
+    visit_with_auth '/notifications?status=unread', 'komagata'
     assert_no_text 'sotugyouさんの質問【 injectとreduce 】でkomagataさんの回答がベストアンサーに選ばれました。'
 
     # 質問者には通知されない
-    visit_with_auth '/notifications/unread', 'sotugyou'
+    visit_with_auth '/notifications?status=unread', 'sotugyou'
     assert_no_text 'sotugyouさんの質問【 injectとreduce 】でkomagataさんの回答がベストアンサーに選ばれました。'
   end
 end
diff --git a/test/system/api/memos_test.rb b/test/system/api/memos_test.rb
deleted file mode 100644
index b0e22417025..00000000000
--- a/test/system/api/memos_test.rb
+++ /dev/null
@@ -1,69 +0,0 @@
-# frozen_string_literal: true
-
-require 'application_system_test_case'
-
-class API::MemosTest < ApplicationSystemTestCase
-  test 'show memo' do
-    visit_with_auth '/reservation_calenders/201911', 'komagata'
-    assert_equal '席予約一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-    within('#memo-2019-11-01') do
-      find('label[for="2019-11-01"]').click
-      fill_in 'memo[body]', with: 'イベント：潮干狩り'
-      click_button '作成'
-    end
-    within('#memo-2019-11-01') do
-      assert_text 'イベント：潮干狩り'
-    end
-  end
-
-  test 'create memo' do
-    visit_with_auth '/reservation_calenders/201911', 'komagata'
-    assert_equal '席予約一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-    within('#memo-2019-11-01') do
-      find('label[for="2019-11-01"]').click
-      fill_in 'memo[body]', with: 'イベント：潮干狩り'
-      click_button '作成'
-    end
-    within('#memo-2019-11-01') do
-      assert_text 'イベント：潮干狩り'
-    end
-  end
-
-  test 'update memo' do
-    visit_with_auth '/reservation_calenders/201911', 'komagata'
-    assert_equal '席予約一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-    within("#memo-#{memos(:memo1).date}") do
-      find("label[for='#{memos(:memo1).date}']").click
-      fill_in 'memo[body]', with: 'イベント：潮干狩り'
-      click_button '更新'
-    end
-    within("#memo-#{memos(:memo1).date}") do
-      assert_text 'イベント：潮干狩り'
-    end
-  end
-
-  test 'delete memo' do
-    visit_with_auth '/reservation_calenders/201911', 'komagata'
-    assert_equal '席予約一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-    within("#memo-#{memos(:memo1).date}") do
-      find("label[for='#{memos(:memo1).date}']").click
-      click_button '削除'
-    end
-    within("#memo-#{memos(:memo1).date}") do
-      assert_no_text memos(:memo1).body
-    end
-  end
-
-  test "cann't delete memo when the user non-admin" do
-    visit_with_auth '/reservation_calenders/201911', 'kimura'
-    assert_equal '席予約一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-    within("#memo-#{memos(:memo1).date}") do
-      assert_no_selector('#memo')
-    end
-  end
-end
diff --git a/test/system/book/borrowed_test.rb b/test/system/book/borrowed_test.rb
deleted file mode 100644
index 47b42215ec7..00000000000
--- a/test/system/book/borrowed_test.rb
+++ /dev/null
@@ -1,10 +0,0 @@
-# frozen_string_literal: true
-
-require 'application_system_test_case'
-
-class Book::BorrwedTest < ApplicationSystemTestCase
-  test 'show listing borrowed books' do
-    visit_with_auth '/books/borrowed', 'kimura'
-    assert_equal '貸出中の書籍一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-  end
-end
diff --git a/test/system/books_test.rb b/test/system/books_test.rb
deleted file mode 100644
index f5680bab240..00000000000
--- a/test/system/books_test.rb
+++ /dev/null
@@ -1,19 +0,0 @@
-# frozen_string_literal: true
-
-require 'application_system_test_case'
-
-class BooksTest < ApplicationSystemTestCase
-  test 'show listing books' do
-    visit_with_auth books_path, 'hatsuno'
-    assert_text '書籍一覧'
-  end
-
-  test 'search books' do
-    visit_with_auth books_path, 'hatsuno'
-    within('form[name=book_search]') do
-      fill_in 'word', with: '現場'
-    end
-    find('#book-search').click
-    assert_text "'現場'の検索結果"
-  end
-end
diff --git a/test/system/borrowings_test.rb b/test/system/borrowings_test.rb
deleted file mode 100644
index 5c3a77e7e9e..00000000000
--- a/test/system/borrowings_test.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-require 'application_system_test_case'
-
-class BorrowingsTest < ApplicationSystemTestCase
-  test 'borrow and return book' do
-    book = books(:book2)
-    visit_with_auth "books/#{book.id}", 'komagata'
-    click_button '借りる'
-    assert_text '書籍を借りました。'
-    click_button '返却する'
-    assert_text '書籍を返却しました。'
-  end
-
-  test 'show borrowed when the book is borrowed' do
-    book = books(:book1)
-    visit_with_auth "books/#{book.id}", 'komagata'
-    assert_text '貸出中'
-  end
-end
diff --git a/test/system/events_test.rb b/test/system/events_test.rb
index 97319dfcb4b..9f80b4438dd 100644
--- a/test/system/events_test.rb
+++ b/test/system/events_test.rb
@@ -336,4 +336,9 @@ class EventsTest < ApplicationSystemTestCase
     visit_with_auth '/events', 'kimura'
     assert_text 'komagata (Komagata Masaki)'
   end
+
+  test 'show pagination' do
+    visit_with_auth '/events', 'kimura'
+    assert_selector 'nav.pagination', count: 2
+  end
 end
diff --git a/test/system/notification/unread_test.rb b/test/system/notification/unread_test.rb
deleted file mode 100644
index ce62c812fc0..00000000000
--- a/test/system/notification/unread_test.rb
+++ /dev/null
@@ -1,32 +0,0 @@
-# frozen_string_literal: true
-
-require 'application_system_test_case'
-
-class Notification::UnreadTest < ApplicationSystemTestCase
-  test 'show listing unread notification' do
-    visit_with_auth '/notifications/unread', 'hatsuno'
-    assert_equal '未読の通知 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-  end
-
-  test 'non-mentor can not see a button to open all unread notifications' do
-    Notification.create(message: 'machidaさんがコメントしました',
-                        kind: 'came_comment',
-                        path: '/reports/20400118',
-                        user: users(:hatsuno),
-                        sender: users(:machida))
-    visit_with_auth '/notifications/unread', 'hatsuno'
-    wait_for_vuejs
-    assert_no_button '未読の通知を一括で開く'
-  end
-
-  test 'mentor can see a button to open to open all unread notifications' do
-    Notification.create(message: 'machidaさんがコメントしました',
-                        kind: 'came_comment',
-                        path: '/reports/20400118',
-                        user: users(:komagata),
-                        sender: users(:machida))
-    visit_with_auth '/notifications/unread', 'komagata'
-    wait_for_vuejs
-    assert_button '未読の通知を一括で開く'
-  end
-end
diff --git a/test/system/notifications_test.rb b/test/system/notifications_test.rb
index 528a1097ad7..1c7afafbed2 100644
--- a/test/system/notifications_test.rb
+++ b/test/system/notifications_test.rb
@@ -50,7 +50,7 @@ class NotificationsTest < ApplicationSystemTestCase
                         path: '/reports/20400118',
                         user: users(:yamada),
                         sender: users(:machida))
-    visit_with_auth '/notifications/unread', 'yamada'
+    visit_with_auth '/notifications?status=unread', 'yamada'
     wait_for_vuejs
     assert_no_text '1番新しい既読の通知'
   end
@@ -170,4 +170,83 @@ class NotificationsTest < ApplicationSystemTestCase
     wait_for_vuejs
     assert_text 'hatsunoさんの【 「コメントと」の日報 】にkomagataさんがコメントしました。'
   end
+
+  test 'show listing unread notification' do
+    visit_with_auth '/notifications?status=unread', 'hatsuno'
+    assert_equal '通知 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
+  end
+
+  test 'non-mentor can not see a button to open all unread notifications' do
+    Notification.create(message: 'machidaさんがコメントしました',
+                        kind: 'came_comment',
+                        path: '/reports/20400118',
+                        user: users(:hatsuno),
+                        sender: users(:machida))
+    visit_with_auth '/notifications?status=unread', 'hatsuno'
+    wait_for_vuejs
+    assert_no_button '未読の通知を一括で開く'
+  end
+
+  test 'mentor can see a button to open to open all unread notifications' do
+    Notification.create(message: 'machidaさんがコメントしました',
+                        kind: 'came_comment',
+                        path: '/reports/20400118',
+                        user: users(:komagata),
+                        sender: users(:machida))
+    visit_with_auth '/notifications?status=unread', 'komagata'
+    wait_for_vuejs
+    assert_button '未読の通知を一括で開く'
+  end
+
+  test 'show listing notification that target is all' do
+    Notification.create(message: 'お知らせの通知',
+                        kind: 'announced',
+                        path: '/announcements/1',
+                        user: users(:komagata),
+                        sender: users(:machida))
+    Notification.create(message: 'コメントの通知',
+                        kind: 'came_comment',
+                        path: '/reports/1',
+                        user: users(:komagata),
+                        sender: users(:machida))
+    visit_with_auth '/notifications', 'komagata'
+    wait_for_vuejs
+    assert_text 'コメントの通知'
+    assert_text 'お知らせの通知'
+  end
+
+  test 'show listing notification that target is announcements' do
+    Notification.create(message: 'お知らせの通知',
+                        kind: 'announced',
+                        path: '/announcements/1',
+                        user: users(:komagata),
+                        sender: users(:machida))
+    Notification.create(message: 'コメントの通知',
+                        kind: 'came_comment',
+                        path: '/reports/1',
+                        user: users(:komagata),
+                        sender: users(:machida))
+    visit_with_auth '/notifications?target=announcement', 'komagata'
+    wait_for_vuejs
+    assert_text 'お知らせの通知'
+    assert_no_text 'コメントの通知'
+  end
+
+  test 'show listing unread notification that target is announcements' do
+    Notification.create(message: '未読のお知らせの通知',
+                        kind: 'announced',
+                        path: '/announcements/1',
+                        user: users(:komagata),
+                        sender: users(:machida))
+    Notification.create(message: '既読のお知らせの通知',
+                        kind: 'announced',
+                        path: '/announcements/2',
+                        user: users(:komagata),
+                        sender: users(:machida),
+                        read: true)
+    visit_with_auth '/notifications?status=unread&target=announcement', 'komagata'
+    wait_for_vuejs
+    assert_text '未読のお知らせの通知'
+    assert_no_text '既読のお知らせの通知'
+  end
 end
diff --git a/test/system/practices_test.rb b/test/system/practices_test.rb
index e342b44e572..862473e02ac 100644
--- a/test/system/practices_test.rb
+++ b/test/system/practices_test.rb
@@ -166,4 +166,25 @@ class PracticesTest < ApplicationSystemTestCase
     index2 = titles.rindex 'Debianをインストールする'
     assert index1 < index2
   end
+
+  test 'update practice in the role of mentor' do
+    practice = practices(:practice2)
+    visit_with_auth "/practices/#{practice.id}/edit", 'yamada'
+    within 'form[name=practice]' do
+      fill_in 'practice[title]', with: 'テストプラクティス'
+      within '#reference_books' do
+        click_link '追加'
+        fill_in 'タイトル', with: 'プロを目指す人のためのRuby入門'
+        fill_in '価格', with: '2345'
+        fill_in 'URL', with: 'http://example.com'
+        find('.reference-books-form-item__must-read').click
+        fill_in '説明', with: 'テストの参考書籍説明'
+      end
+      click_button '更新する'
+    end
+    assert_text 'プラクティスを更新しました'
+    visit "/practices/#{practice.id}"
+    wait_for_vuejs
+    assert_equal 'テストプラクティス | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
+  end
 end
diff --git a/test/system/reservation_calenders_test.rb b/test/system/reservation_calenders_test.rb
deleted file mode 100644
index f7cdbd2a27a..00000000000
--- a/test/system/reservation_calenders_test.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-require 'application_system_test_case'
-
-class ReservationCalendersTest < ApplicationSystemTestCase
-  test 'show this month reservation calender' do
-    visit_with_auth '/reservation_calenders', 'komagata'
-    assert_equal '席予約一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-  end
-
-  test 'show next month of 2019/10 reservation calender' do
-    visit_with_auth '/reservation_calenders/201910', 'komagata'
-    click_link 'next-month'
-    assert_text '2019年11月'
-  end
-end
diff --git a/test/system/reservations_test.rb b/test/system/reservations_test.rb
deleted file mode 100644
index 73f0e81264b..00000000000
--- a/test/system/reservations_test.rb
+++ /dev/null
@@ -1,49 +0,0 @@
-# frozen_string_literal: true
-
-require 'application_system_test_case'
-
-class ReservationsTest < ApplicationSystemTestCase
-  test 'create reservation' do
-    visit_with_auth '/reservation_calenders/201911', 'hatsuno'
-    assert_equal '席予約一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-    within("#reservation-2019-11-02-#{seats(:seat2).id}") do
-      find('#reserve-seat').click
-    end
-    within("#reservation-2019-11-02-#{seats(:seat2).id}") do
-      assert_text 'hatsuno'
-    end
-  end
-
-  test 'delete reservation' do
-    visit_with_auth '/reservation_calenders/201911', 'hatsuno'
-    assert_equal '席予約一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-    accept_confirm do
-      within("#reservation-#{reservations(:reservation4).date}-#{reservations(:reservation4).seat.id}") do
-        find('#cancel-reservation').click
-      end
-    end
-    within("#reservation-#{reservations(:reservation4).date}-#{reservations(:reservation4).seat.id}") do
-      assert_no_text 'hatsuno'
-    end
-  end
-
-  test 'reservations beyond one month cannot be made' do
-    travel_to Time.zone.local(2020, 1, 1, 0, 0, 0) do
-      reservation_date = Date.current.next_month.tomorrow
-      visit_with_auth "/reservation_calenders/#{reservation_date.strftime('%Y%m')}/", 'hatsuno'
-      assert_equal '席予約一覧 | FJORD BOOT CAMP（フィヨルドブートキャンプ）', title
-
-      accept_confirm do
-        within("#reservation-#{reservation_date}-#{seats(:seat2).id}") do
-          find('#reserve-seat').click
-        end
-      end
-
-      within("#reservation-#{reservation_date}-#{seats(:seat2).id}") do
-        assert_no_text 'hatsuno'
-      end
-    end
-  end
-end
diff --git a/test/system/users_test.rb b/test/system/users_test.rb
index bf96e99482e..c539c55225b 100644
--- a/test/system/users_test.rb
+++ b/test/system/users_test.rb
@@ -77,17 +77,6 @@ class UsersTest < ApplicationSystemTestCase
     assert_no_text 'Terminalの基礎を覚える'
   end
 
-  test 'show my seat today' do
-    visit_with_auth '/', 'hajime'
-    assert_text '今日はF席を予約しています'
-
-    visit_with_auth '/', 'kimura'
-    assert_text '今日はE席を予約しています'
-
-    visit_with_auth '/', 'kensyu'
-    assert_no_text '予約しています'
-  end
-
   test 'show last active date only to mentors' do
     travel_to Time.zone.local(2014, 1, 1, 0, 0, 0) do
       visit_with_auth '/', 'kimura'
diff --git a/yarn.lock b/yarn.lock
index d9ffaeacddd..2e330f3135b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7406,9 +7406,9 @@ tapable@^1.0.0, tapable@^1.1.3:
   integrity sha512-4WK/bYZmj8xLr+HUCODHGF1ZFzsYffasLUgEiMBY4fgtltdO6B4WJtlSbPaDTLpYTcGVwM2qLnFTICEcNxs3kA==
 
 tar@^6.0.2:
-  version "6.1.3"
-  resolved "https://registry.yarnpkg.com/tar/-/tar-6.1.3.tgz#e44b97ee7d6cc7a4c574e8b01174614538291825"
-  integrity sha512-3rUqwucgVZXTeyJyL2jqtUau8/8r54SioM1xj3AmTX3HnWQdj2AydfJ2qYYayPyIIznSplcvU9mhBb7dR2XF3w==
+  version "6.1.11"
+  resolved "https://registry.yarnpkg.com/tar/-/tar-6.1.11.tgz#6760a38f003afa1b2ffd0ffe9e9abbd0eab3d621"
+  integrity sha512-an/KZQzQUkZCkuoAA64hM92X0Urb6VpRhAFllDzz44U2mcD5scmT3zBc4VgVpkugF580+DQn8eAFSyoQt0tznA==
   dependencies:
     chownr "^2.0.0"
     fs-minipass "^2.0.0"