Fresh out of jail a smartmouth wise guy Goro takes the name Big Brother Katsumata Not fitting in well with established gangs he forms a ragtag gang called the Shinjuku Brothers The members of their gang are thugs who only wish they were traditional yakuza When they turn up at the funeral for a gangster they are not welcomed but a senior boss intervenes to keep things calm The boss of bosses invites them to join a respected local council of warlords Katsumata is suspicious of why such powerful men would extend an invitation to lowlife like himself