The main character, The Rapeman, is a high school teacher by day and dispenses "great justice" at night under the business Rapeman Services, which is co-run with his uncle, a former surgeon. The business' motto is: "Righting wrongs through penetration".
Clients call on The Rapeman to handle cases such as the revenge of a jilted lover, forming parental bonds through a traumatic crisis, making disruptive co-workers more docile and other things of that nature. When engaged in his night trade, The Rapeman wears a black leather ski mask shaped like the head of a penis but no trousers or underwear. In the middle of a rape, if the woman becomes unresponsive or expresses enjoyment, he uses special techniques such as "M69 Screwdriver" or "Infinite Loop" to apply more pain to the victim. Despite regretting some of the contracts he fulfills, he always does the job.
The comic was made to appeal to middle aged Japanese men, but failed to find an audience, and was discontinued after 13 volumes. Still sensing the concept's marketability, Pink Pineapple produced nine Rapeman live action feature films, released between 1993 - 1996. The first seven were directed by Takao Nagaishi and the final two were directed by Naoki Uesugi. A two-episode OVA was released in 1994 chronicling his exploits in the first volume of the manga. The Rapeman's garb is different in the anime version, as he is dressed in quasi-ninja gear.
The comic received a cult following in the United States due to its name, the curiosity of the subject matter.
A band called Rapeman draws its name from the comic.