Hanamura, widely known in gangland a professional trouble shooter has the sign of the Jack tattooed on his chest. His follower is his sworn partner Kurahara. They attempt to help the Towada-Gumi gang against its rival group the Kamioka-Gumi which is seeking the chance to conquer the Towada-Gumi in collusion with Noda, a big shot in the town operating a real estate firm.
Motozo Imamura, a.k.a. Gen, grew up in an upper-class family, but he never went to school and spent his days playing around. One day, he walked into an orgy of male-female sexual misconduct, and when he dropped off Roze, whom he had met there, he saw her sister, Kaoru, forgetting her impurity. One day, he went to an orgy where he met Roze, and he could not forget the purity of her older sister, Kaoru. A few days later, Gen went to the party again and was mistaken for the boss's brother.
On a cold winter day, Goro Fujikawa (Tetsuya Watari) and Masahiko murder the mob boss of Meishin-Kai. The deed costs them time in prison, but Goro had no shred of regret. When Goro is released 2 years later, Masahiko is dying in prison hospital and entrusts his last wish; "find my sister and take care of her." Goro leaves as a free man with a mission, but soon finds that he might have been better off in jail.
Emerging from a stint in prison, yakuza lieutenant Sumukawa discovers that his gang has disintegrated. An ambitious type, he quickly hooks up with another gang who promise him a prominent position if he helps them deal with a rival family. But bonds are made to be broken, and pledges of loyalty soon give way to competition, betrayal and — naturally — retaliation.