Joe Yabuki is an aimless young man who runs away from an orphanage with no money and no place to stay. He runs into a former boxing trainer, Danpei, who still has a strong passion for boxing. Danpei watches Joe fight and regains his desire to train future boxers. Joe, however, does not have any interest in boxing until he ends up in a juvenile prison where he meets Rikiishi, a former boxing prodigy. They quickly develop a rivalry, and a newfound interest in boxing overcomes everybody in prison, including Joe.
Joe Yabuki is an aimless young man who runs away from an orphanage with no money and no place to stay. He runs into a former boxing trainer, Danpei, who still has a strong passion for boxing. Danpei watches Joe fight and regains his desire to train future boxers. Joe, however, does not have any interest in boxing until he ends up in a juvenile prison where he meets Rikiishi, a former boxing prodigy. They quickly develop a rivalry, and a newfound interest in boxing overcomes everybody in prison, including Joe.