Ambition Without Honor (1996)

Seventeen year old Tetsuya kills the boss of a rival gang with the promise of being made. After seven years of prison, he discovers that he is all but forgotten by his Family. The two rival Families have reconciled and Tetsuya was been discarded to keep the peace. Wanted what he was promised, Tetsuya becomes a one-man path of destruction, only to be betrayed once again…