Nanno appears as a yakuza-esque teacher recruited to whip the delinquents into shape, which he does quite a good job of until he is challenged to a one-on-one fight against Ryuji, who refuses to accept his bullying tactics. Eikichi, Abe and Saejima, who know that even Ryuji is no match for Nanno’s ‘Hokuto Shin Ken’ style martial arts, dig around until they find an incriminating fact- Nanno has a lolita complex. They bring the elementary school girl that got him in trouble, Miyo-chan (who always has a black strip over her eyes) to the fight, and threaten to tell everyone if he doesn’t lose to Ryuji. So Ryuji wins, and Nanno is forced to be the Oni-Baku-gumi’s slave. He leaves the school after fighting Kiwamezawa and trying to escape the police.