is a Japanese media franchise created by
Go Nagai. Harenchi Gakuen was one of the manga serialized in the very first issue of
Shueisha's manga magazine
Weekly Shonen Jump. The series was the first big success for Go Nagai. It is also considered as the first modern erotic manga, sometimes considered the first
hentai manga, though Nagai never used explicit sexual situations in the original run of the manga.