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.

Hana is embarrassed when Kiyoshi sees her in a compromising position. Kiyoshi becomes desperate to keep his date with Chiyo, and searches for a way to get out of prison in time to meet her. Gakuto has plans of his own.