Wolf Guy (1975)

Akira Inugami is the only survivor of a clan of ancient werewolves who relies on his supernatural powers to solve mysterious crimes. After a series of bloody killings perpetrated by an unseen force, Inugami uncovers a conspiracy involving a murdered cabaret singer, corrupt politicians, and a plot by the J-CIA to harvest his blood in order to steal his lycanthropic powers! At the same time, Inugami also discovers the truth behind his family heritage, and that he may not be the last of his kind.