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.

Andre suffers a mental collapse when he goes for a week without receiving any discipline. Shingo takes Anzu to the movies, but finds his expectations betrayed. The Underground Student Council moves forward with their DTO project.

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?