Jun Furushô

The story is about a soft spoken, high school teacher who takes vengeance into his own hands at night by becoming Rape Man. He and his Uncle are partners in Rape Service. Where they offer rape as a means of Justice. They take their earned money through Rape Service and donate all of it to an orphanage which our hero grew up in. Their motto is "Righting Wrongs Through Penetration". (imdb)

A demon possess and attacks a group of student campers.

The lust demon moves to the city and is hunted by a priest.

The story is about Rapeman and his Uncle who are a tag-team of sorts and created a company together where their motto is "Righting Wrongs Through Penetration". People want revenge Rapeman style, they go to the Uncle, and if it's rape worthy, Rapeman does what he does best. Anyways in Rapeman 2, Rapeman Co. has realized that the hospital and the mafia are somehow related and they decide enough is enough. (imdb)

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. (mydramalist.com)

Not to be confused with the 1995 theatrical film directed by Shûji Kataoka.