Seiji is a third generation "Gosei kai" gang member. He works to build up the group's strength. Meanwhile, a journalist investigates a case that occurred 19 years ago. He meets Hayato, Daisuke and Asami.

Five women snatch one billion yen in jewellery from the yakuza, while construction manager Toyama burns for revenge against the mobsters who raped and caused the death of his wife. Before long, the yakuza and Toyama arrive at the women's hideout.

Gonin is a movie about five assassins who are forced to work together to carry out a hit on a mob boss. As they plan and execute their mission, they face various obstacles and personal dilemmas. The plot is filled with action, drama, and revenge.