Everyday salary man Shimano Yuji meets and beds a pretty young girl at his bachelor party. Meeting her again at his wedding, he realizes that he has just began an affair with his sister-in-law.

Maki Fujishiro (Yoko Natsuki), the leader of the Fujishiro group, who is feared to be a female leopard in the Hokuriku region, appears in the Kanto region with a young head, Akatsu (Hirotaro Honda). She is said to have chased her niece Natsumi (Megumi Kanzaki) who ran away with the money of the group. Hitoshi Kamibayashi (Riki Takeuchi), acting head of the sand group, and Yoshiro Yazaki (Toshihiko Sakakibara), the chairman of the group, will be ordered by the Kanto Ichienkai to help. As the search progresses, Jin gets angry at Akatsu's excessive violent behavior and the tension grows. And the intention of Hokuriku's expansion into the Kanto region, which is behind the incident, becomes clear.

A dispute also occurred at the Hitachi Union, an organization next to the Kanto Ichienkai, to which Hitoshi and Yoshiro belong. It is said that the emerging Komada group is in a state of immediate action aiming at the long-established Fujishiro group's sima. Voices of anxiety began to rise even within the Kanto Ichienkai due to the turmoil of the neighboring organization. And it was also the fear of the Kanto full-scale war that would come if the emerging Komada group won the Hitachi Union. Sakai, the chairman of the Ichienkai, immediately entrusts Yoshiro with the task of collecting the situation and infiltrates the Imamura group, which is a subordinate organization of the Hitachi Union.