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Prison School was an anime series that ran from 2015 to 2016. In total 13 episodes of Prison School were aired. Prison School has no reported filler. Kiyoshi is one of the new boys at a formerly girls-only school, but he discovers to his shock that he and his four friends are the only male students among 1,000 girls. The draconian laws that are still in place make the school even worse, which punishes even the most minor infractions with a stay in the school's prison. The five boys are then caught peeping in the girls’ shower room, and their subsequent “arrest” by the Underground Student Council causes the five boys to be given the choice of staying a month in the school's “Prison Block” or being expelled. The boys are incarcerated in the Prison Block together and Kiyoshi is overwhelmed by the discovery that all the other boys are masochists that revel in the punishments handed to them by their attractive but vicious supervisors.