On the high-security prison island known as Boudokan (暴童監獄島), where the most dangerous female convicts are incarcerated, a group of prisoners is suddenly assembled by a mysterious, pig-masked warden. The atmosphere is tense—the women brace for a lethal death game, but instead, the warden reveals a table piled with ordinary, commercially available board games. The true stakes, however, are far from ordinary: after each game, the loser is injected with a powerful aphrodisiac via an implanted collar, forcibly pairing them with their opponent in an attempt to create what the warden calls “girls’ love” or yuri relationships.

The story follows Kumiko, a stoic and battle-hardened female yakuza who approaches these absurd games with deep skepticism and a refusal to be manipulated. She becomes the de facto anchor for the reader as the prison’s bizarre rehabilitation program unfolds. Other inmates include a variety of personalities—each with their own criminal background and psychological quirks—who are thrown together in a mix of cooperation, rivalry, and reluctant bonding.

The narrative arcs revolve around a series of board games ranging from classic strategy games to bluffing and party games, with the added tension of the aphrodisiac penalty. As the women play, they engage in psychological warfare, form tentative alliances, and reveal hidden aspects of their pasts. The warden’s ultimate motives and the true nature of the prison are slowly hinted at, while the comedic tone balances the dark premise with absurd humor, service scenes, and genuine moments of connection between the characters.