In 1974, Japan's youth were caught in the throes of an intense college entrance exam crisis, facing mounting academic pressure. Meanwhile, students driven to the edge by relentless studying were swallowed by societal decay, leading to a surge in juvenile delinquency. In response, a special school was established nationwide to rehabilitate wayward youths and guide them toward becoming productive members of society. Assigned to this institution was the female teacher Moretsu Mask. She fought daily against the school's dark underbelly, punishing delinquent students and corrupt faculty alike. However, unbeknownst to her, a grotesque entity lurked beneath the school—an abominable presence known as the Human Chair. This creature began moving with the sole purpose of consuming the beautiful warrior of justice. The school principal, possessed by a demon, rendered Moretsu Mask's finishing moves powerless and offered her as a sacrifice to the Human Chair. Confronted by the hideous form before her, Moretsu Mask felt overwhelming terror. Stripped of her ability to fight, she fell completely under the Human Chair's control. Its tentacles plunged violently into her vagina, driving her to repeated, uncontrollable orgasms. Gradually, both her body and mind shattered, until finally, Moretsu Mask lay forever exposed as a beautiful corpse atop the Human Chair—. [BAD END]