Onani means masturbation. And that's what this guy is good at. Every day after school, he sneaks into the mostly unused girls bathroom on the 3rd floor, and masturbates. Until one day when he's caught.....
seems like hentai? No it is not! This story is wicked good and it only has 5 chapters. Not a typical type kinda manga. Well not too typical.
No this is not some yaoi!.
Read up to chapter 5, guaranteed your satisfied. lol rhymed.