Hentai tells the story of an academy where various sexual disciplines are taught and students and pupils are held in detention. The young teacher Makoto got here quite by accident, and now she is forced to keep silent in order to protect her family. She is forced into various sexual experiments and has no right to refuse. In the end, Makoto's stay in this strange educational institution was clearly planned by one of her admirers, who was even willing to steal her if the plan failed.