Prison School

Hachimitsu Private Academy, once a prestigious all-girls' boarding school, has opened its doors to male students for the first time. Among the five boys admitted is Kiyoshi Fujino, who quickly discovers the overwhelming challenge of being one of the few males in a sea of over a thousand girls. Initially excited, the boys' curiosity leads them into trouble when they are caught trying to peek into the girls' bath.

Their mischief results in severe consequences, as they are sentenced to a month in the school's prison by the fearsome Underground Student Council. The boys must now endure harsh punishments and grueling tasks while attempting to survive their incarceration. Their journey in Prison School tests their friendship and resilience as they navigate the treacherous waters of high school life under strict supervision.