The Tokyo police have just discovered the dead bodies of married Kôichi Takeshita and his mistress in a double suicide, the suicide note stating their inability to sustain their relationship in light of his marriage the reason for this action. Meanwhile, thuggish, womanizing Jo Mizuno has just been hired as muscle for the Nomoto yakuza, despite, or in light of his initial action bringing him to the attention of the yakuza being against one of their own. The yakuza makes most of its money through drugs and prostitution. While Mizuno does prove to be an effective heavy for Nomoto, he also comes to the attention of the rival Sanko yakuza, he secretly proposing to Sanko for him to act as a double agent of sorts solely in his want to double dip to line his own pocket. In reality, Mizuno has taken this entire action with the two yakuzas in relation to the double suicide, he playing a dangerous game where those against who he is working not hesitating to kill him if they discover the truth about him as he himself tries to discover the truth behind the suicides.
—Huggo