Jitsuroku Juku no tsura: Shinjuku gurentai monogatari (1997)

The strength of legendary gangster, Kanou and Ando, keeps growing fight after fight. They never belong to anybody, but themselves. Therefore the other youngsters look up to them. But the appearance of Kantou-Sone family suddenly changes the circumstances around the Kanou family. Now, they're up for the fight, on their own, without much of help from outsiders ...