こちら側が意図した現象じゃないっぽいね
https://twitter.com/muvluvseries/status/952446582057713665
Dear All, we are aware that there is an issue with the Steam Store, and we
are currently in contact with Valve to resolve it. The game will be back up
within the week. We apologize for the confusion, please be patient while we
resolve the issue. #MuvLuv