Situated on Tokyo"s outskirts, Hachimitsu Private Academy has long been a renowned all‑girls boarding institution, celebrated for its rigorous curriculum and well‑disciplined pupils. Yet everything is poised to shift when the school"s flagship rule is amended, allowing male students to enroll.
In the opening weeks of the first semester under this new mandate, only five boys were admitted, creating a 200‑to‑1 ratio of girls to men. Kiyoshi, Gakuto, Shingo, André, and Jo find themselves sidelined before they can leave a mark. Struggling to connect with the female cohort, the determined lads turn their attention to an even riskier venture: spying on the girls" bath.
Their scheme is swiftly dismantled by the notorious Underground Student Council, and the ragtag group has their freedom snatched away as they are locked in the school"s detention cell for a month. Thus begins their grim chapter in Prison School, an ordeal that will test the strength of friendship and twisted camaraderie.
