diff --git a/.pfnci/common.sh b/.pfnci/common.sh
index 0225dfabb0..acc7e69114 100644
--- a/.pfnci/common.sh
+++ b/.pfnci/common.sh
@@ -15,38 +15,59 @@ TEMP=$(mktemp -d)
 mount -t tmpfs tmpfs ${TEMP}/ -o size=100%
 
 REPOSITORY=${REPOSITORY:-chainercv}
-if [ ${REPOSITORY} = chainercv ]; then
-    cp -a . ${TEMP}/chainercv
-elif [ ${REPOSITORY} = chainer ]; then
-    CHAINER=local
-    cp -a . ${TEMP}/chainer
-    mv ${TEMP}/chainer/chainercv/ ${TEMP}/
-fi
+case ${REPOSITORY} in
+    chainercv)
+        CUPY=${CHAINER}
+        cp -a . ${TEMP}/chainercv
+        ;;
+    chainer)
+        CHAINER=local
+        CUPY=master
+        cp -a . ${TEMP}/chainer
+        mv ${TEMP}/chainer/chainercv/ ${TEMP}/
+        ;;
+    cupy)
+        CHAINER=master
+        CUPY=local
+        cp -a . ${TEMP}/cupy
+        mv ${TEMP}/cupy/chainercv/ ${TEMP}/
+        ;;
+esac
 cd ${TEMP}/
 
-if [ ${CHAINER} = stable ]; then
-    echo pip${PYTHON} install \
-         chainer==${STABLE} \
-         cupy-cuda92==${STABLE} >> install.sh
-elif [ ${CHAINER} = latest ]; then
-    echo pip${PYTHON} install \
-         chainer==${LATEST} \
-         cupy-cuda92==${LATEST} >> install.sh
-elif [ ${CHAINER} = master ]; then
-    CHAINER_MASTER=$(git ls-remote https://github.com/chainer/chainer.git master | cut -f1)
-    echo pip${PYTHON} install \
-         git+https://github.com/chainer/chainer.git@${CHAINER_MASTER}#egg=chainer >> install.sh
-
-    CUPY_MASTER=$(gsutil -q cp gs://tmp-pfn-public-ci/cupy/wheel/master -)
-    gsutil -q cp gs://tmp-pfn-public-ci/cupy/wheel/${CUPY_MASTER}/cuda9.2/*.whl .
-    echo pip${PYTHON} install cupy-*-cp${PYTHON}*-cp${PYTHON}*-linux_x86_64.whl >> install.sh
-elif [ ${CHAINER} = local ]; then
-    echo pip${PYTHON} install -e chainer/ >> install.sh
-
-    CUPY_MASTER=$(gsutil -q cp gs://tmp-pfn-public-ci/cupy/wheel/master -)
-    gsutil -q cp gs://tmp-pfn-public-ci/cupy/wheel/${CUPY_MASTER}/cuda9.2/*.whl .
-    echo pip${PYTHON} install cupy-*-cp${PYTHON}*-cp${PYTHON}*-linux_x86_64.whl >> install.sh
-fi
+case ${CHAINER} in
+    stable)
+        echo pip${PYTHON} install chainer==${STABLE} >> install.sh
+        ;;
+    latest)
+        echo pip${PYTHON} install chainer==${LATEST} >> install.sh
+        ;;
+    master)
+        CHAINER_MASTER=$(git ls-remote https://github.com/chainer/chainer.git master | cut -f1)
+        echo pip${PYTHON} install \
+             git+https://github.com/chainer/chainer.git@${CHAINER_MASTER}#egg=chainer >> install.sh
+        ;;
+    local)
+        echo pip${PYTHON} install -e chainer/ >> install.sh
+        ;;
+esac
+
+case ${CUPY} in
+    stable)
+        echo pip${PYTHON} install cupy-cuda92==${STABLE} >> install.sh
+        ;;
+    latest)
+        echo pip${PYTHON} install cupy-cuda92==${LATEST} >> install.sh
+        ;;
+    master)
+        CUPY_MASTER=$(gsutil -q cp gs://tmp-pfn-public-ci/cupy/wheel/master -)
+        gsutil -q cp gs://tmp-pfn-public-ci/cupy/wheel/${CUPY_MASTER}/cuda9.2/*.whl .
+        echo pip${PYTHON} install cupy-*-cp${PYTHON}*-cp${PYTHON}*-linux_x86_64.whl >> install.sh
+        ;;
+    local)
+        echo pip${PYTHON} install -e cupy/ >> install.sh
+        ;;
+esac
 
 echo pip${PYTHON} install -e chainercv/ >> install.sh