The proud, self-destructive, punk/anti-hero violates national boundaries without compunction in late 60s/early 70s cinema. Here Isamu Okita (Bunta Sugawara), often simply called "Bro", is reminiscent not only of Alex (A Clockwork Orange) but also of Ivan (The Harder They Come), Johnny Boy (Mean Streets) and even of Michel (À bout de soufflé).
'Gendai yakuza: hito-kiri yota' (which, in English, apparently means something like Outlaw Killer or Street Mobster) is a restless, prowling movie that occasionally bursts into hyperkinetic action. Something about the verging-on-ludicrous action scenes gives the viewer almost the same sense of release that Bro and the other punks feel.
Isamu is a punk, a whore-son, born on the margins of post-war society. By virtue of his own courage and propensity for violence he becomes the leader of a street gang and attracts the attention of the more established yakuza crimelords. Most of the drama revolves around the conflict between his pride and his superiors.
'Street Mobster' is very well filmed and has aged well, it's influence on films like 'Fight Club' is palpable.