Synopsis
Hachimitsu Private Academy, a prestigious boarding institution on the outskirts of Tokyo known for its rigorous standards, faces a drastic shift when its historic all-girls policy is abolished to admit male students. At the beginning of the new semester, only five young men—Kiyoshi, Gakuto, Shingo, Andre, and Jo—are accepted, resulting in an overwhelming ratio of two hundred girls to every single boy. Struggling to integrate, the inexperienced boys abandon their attempts at normal social interaction and instead fixate on the perilous goal of spying on the female students in the baths. Their scheme is swiftly crushed by the notorious Underground Student Council, leading to their immediate imprisonment within the school grounds for a month. This marks the start of their brutal existence in Prison School, a harrowing ordeal that challenges both their friendships and their twisted sense of camaraderie.