クリスマスのおしまい
Revert "Merge pull request #244 from mamebro/xmas"

This reverts commit 1f1b877e8dbd92face70baea3cb6d319f335bf5b, reversing
changes made to 624f30ebab2b739c81bbb1fd48b5a63fae74b556.
Merge pull request #245 from mamebro/end-of-xmas

クリスマスのおしまい