Basically this is a solid but not stellar Yakuza movie, with some fun twists that make it memorable.
Bunta is his usual excellent self as our "hero," a machine-gun wielding gangster who pals around with bikers and commits robberies with his mother (!?). Eventually, the guys he ripped off come looking for him and he's forced to flee with his incredibly hot girlfriend, who has amazing outfits and no personality.
The things that make this one stand out are a bizarre and possibly incestuous mother fixation, Bunta and his girlfriend's fabulous 20's era gangster and moll outfits, some fun violent set-pieces, and an assassination in a prison bath that was different than anything I'd seen before.
This one gets a marginal recommendation, definite thumbs up if you're a Yakuza flick fan, though it's not on the level of Fukasaku's better work.