Burdened with enormous debt to support her family, Kasumi became a prostitute to earn money. Hayama, an employee, had harbored feelings for her from the first time he saw her. Kasumi quickly became accustomed to her work as a prostitute, becoming a popular choice, driving men wild with her mat and shampooing techniques. Then, one day, she collapsed from a severe headache…

Keisuke is a timid and nerdy high-school teacher by day, and a leather clad rapist "superhero" by night. One day, one of Keisuke's students is found dead, and her death is ruled an accident. Keisuke and the girl's mother don't believe her death to be accidental – and upon investigation, Keisuke and Uncle Shotoku unknowingly delve into an underground world of shady cops, scummy drug dealers, corrupt teachers, and a rape-porn ring. Of course, with Rapeman's upstanding moral values, he must do something to avenge the young student's death, bring down the criminals and right wrongs through penetration!