Oide yo! Shiritsu Yarimakuri Gakuen

Fuente: AniList

The Principal changed the school rules by encouraging all his students to have sex so they could be more eager to follow the lessons and go to school. The chairman of the Mira Committee disagreed with the regulation. Another student on sex while Mira just want to rest on the roof of the school building. At that time, he met a man lying alone by showing off his penis. (Source: Nekopoi and Has Been Translated)