In 1950
Hiroshima City, gambler Shoji Yamanaka is involved in a fight over cheating in a card game and stabs several men. He is sentenced to two years in prison, where he befriends Shozo Hirono,
who is already serving time for murder. Following Yamanaka's release from prison, he visits a restaurant but can't pay his bill. The owner, Yasuko, offers to let him eat for free, but when he insists on paying her with his watch, a gang led by Katsutoshi Otomo, the rebellious son of yakuza patriarch Choji Otomo, beat him severely before the fight is stopped by the senior Otomo. Swearing to take revenge on his attackers, Yamanaka accepts an offer from Boss Muraoka, Yasuko's uncle, to join his yakuza clan. Yamanaka is assigned to the family of Muraoka's sworn brother, Kunimatsu Takanashi, until he is chased out of Hiroshima by Muraoka for beginning a romantic relationship with the widowed Yasuko; Takanashi arranges for him to temporarily join a family in
Kyushu. Yamanaka redeems himself a year later by carrying out a hit for the yakuza family sheltering him, and Muraoka welcomes him back as a formal member in a ceremony witnessed by his associate, Kanichi Tokimori. Katsutoshi is kicked out of the Otomo Family by his father for trying to muscle in on Muraoka's territory and forms his own family with Tokimori's support in a bid to take over Hiroshima. In retaliation, Muraoka expels Tokimori, prohibiting him from conducting any business in the city. Tokimori flees to
Kure, while Katsutoshi and his men spark a war by attacking the Muraoka family offices. In Kure, Hirono's former boss Yoshio Yamamori pays him and his small family to protect Tokimori while he works to resolve the dispute. However, when Yamanaka shows up in Kure with orders to kill Tokimori, Hirono makes his own decision to assassinate Tokimori as a means of both settling the dispute and protecting his friend's honor. The Otomo Family gains new leadership, and Muraoka reconciles with them on the condition that Katsutoshi dissolve his family. Muraoka also gives his blessing for Yamanaka to pursue Yasuko, only to then call on him to kill three of Katsutoshi's men who were planning to assassinate the Otomo Family chairman and reignite the war. Yamanaka is arrested by waiting policemen for the murders and is sentenced to life in prison. Takanashi, also held for a minor offense, informs Yamanaka that Muraoka is coercing Yasuko into marrying her deceased husband's brother. Yamanaka manages to escape from prison by feigning illness. When he attempts to assassinate his boss, Muraoka suggests that Takanashi may have lied. Yamanaka pleads for another opportunity and offers to eliminate Katsutoshi. Although he only injures him, Katsutoshi is later arrested and sentenced to life imprisonment. His deputy is fatally stabbed after meeting with Muraoka, and the remaining members are jailed. The Otomo Family, weakened by internal strife, is absorbed into the Muraoka Family. Muraoka orders Yamanaka to kill Takanashi for his betrayal but also alerts the authorities, who are ordered to shoot Yamanaka on sight and seal off the entire neighborhood to trap him. Cornered, Yamanaka takes his own life with his gun. At his funeral, Hirono glares angrily at Muraoka, while Yamamori and other mourners praise Yamanaka for preserving his boss's honor. ==Cast==