Sakigake!! Otokojuku Japan

Sakigake!! Otokojuku is a manga series written and illustrated by Akira Miyashita. It was originally serialized at the Weekly Shonen Jump from 1985 to 1991. It is staged in a private boy's school that teaches oendan to troubled teenagers. The students are trained to 'revive the Spirit of Japan' and mainly engage in fighting courses.