Onaho Kyoushitsu : Joshi Zenin Ninshin Keikaku The Animation

This is the anime adaptation of the manga Onaho Kyoushitsu: Joshi Zenin Ninshin Keikaku by Oouso.

In addition to being the only boy in his class, Shujinkou is harassed by three of his classmates. One day, he receives a mysterious object allowing him to have sex with any girl. Thus, the young man decides to take revenge on his three comrades.