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!

Hitomi Shiraki is a carefree, happy housewife in her first year of marriage. Drawn by favorable conditions such as three meals, naps, sex included, and a permanent job with a house included, she even dropped out of the university she had been attending and married Koji, an assistant professor at her school. From the outside, their married life appears happy, but her sex life is full of dissatisfaction. The cause is the presence of her older sister, Yuriko, who is living with them under the condition that she will stay only until marriage. Because she is considerate of Yuriko, her sex with Koji is always incomplete, and Hitomi’s stress is on the verge of exploding.