Five boys newly enrolled in a formerly all-girls school, already having difficulty connecting with the girl students, run afoul of the school’s "Underground Student Council" and face strict disciplinary measures.

After committing a heinous offense against Mari, Gakuto receives a drastic punishment from Meiko. Kiyoshi and Gakuto work desperately to break Kiyoshi out of the prison by having him impersonate a girl.

Mari introduces the DTO plan to Hana, and they begin plotting ways to drive the boys out of school. Shingo leads the others boys in shunning Kiyoshi, but Meiko has plans to drive an even deeper wedge between them.

Hana continues pressing Kiyoshi in order to exact her revenge, but Kiyoshi employs an adaptation of a classical military strategy to counter her. Once all the boys are locked into their cells for the night, will they be able to complete their plan?