The club is an after-school club at the Hinamizawa school led by Mion Sonozaki. The club plays various games together with punishments for the loser of each game. Cheating is allowed if a member can successfully get away with cheating. The club was originally formed in order to give Satoko and Satoshi Houjou a reason to stay at school and have fun as well as avoid their abusive aunt. The club has three rules:
- Club members must strive for first place with a full-hearted attitude.
- As a club member, you must do whatever it takes to win (which includes playing unfair).
- You must go through the punishment no matter what.