Blood Shed (1966)

Original title: 日本任侠伝 血祭り喧嘩状

Ginjiro was born to a family of nobility, though he yearned for freedom. To earn this freedom, he affiliates himself with the worst of the worst. Swearing his allegiance to the notorious Kuroiwa crime syndicate, the yakuza family known for its thirst for blood, Ginjiro equips for battle. When a rival family raids their gambling parlor, he slashes a masked henchman. Unbeknown to him, his victim was no henchman.