As a 6 Year Old Henisei-Tashu-Ijou-Syndrome(Hentai-Syndrome) is diagnosed that cuold kill him if he gets sexual excited.To prevent him from dieing his father teaches him the ways to controll his body for ten years in the mountains. With 16 he enrolls in Nangokuren-Highschool that he thought is an All-Boys-School but in reallity is an All-Girls-School that just got coed.