High school dropout Hayato gets locked up in juvenile prison, where his usual stuck up attitude puts him in trouble with the other delinquents. This installment marks the return of undefeated Yanki (Japanese delinquent) boss, Monji Mori, who becomes Hayato’s nemesis.

Takumi, the former boss of the Black Black Black Skull Gang, is about to graduate and he chooses Taiga as his successor. During the handover, a transfer student named Monji tries to usurp the throne of the Black Skull Gang.