Urotsukidouji

Urotsukidōji: Legend of the Overfiend (Japanese: 超神伝説うろつき童子, Hepburn: Chōjin Densetsu Urotsukidōji) is a Japanese erotic horror manga series written and illustrated by Toshio Maeda. First serialized in Manga Erotopia from 1985 to 1986, Urotsukidōji marked a departure from Maeda's earlier works, with its focus on erotica, dark humor, and the supernatural. Starting in 1987, the manga was adapted into a series of original video animation (OVA) anime releases by director Hideki Takayama. The adaptations deviate significantly from the manga, adding elements of violence, sadomasochism, and rape not present in the source material. Urotsukidōji has been credited with popularizing the trope of tentacle rape, and The Erotic Anime Movie Guide calls it a formative work in the hentai genre. In 2005, it was voted as one of the 100 greatest cartoons in a poll by Channel 4. (Source: Wikipedia)