Taiga, the eldest son of Gunji Washio, the president of the Naito Shinjuku family - Japan's oldest Yakuza family with a tradition of hereditary succession. Although he is still in elementary school, he is trained by Reij to be the heir. However, compare to his father wild personality, Taiga is a crybaby and timid, and feels uneasy about becoming the heir. Then, Gunji's younger brother, who was thought to be dead, assassinates him. The Naito Shinjuku family finds itself in a tight spot. Meanwhile someone kidnaps Taiga...

After the death of the president, the Naito Shinjuku family tries to rebuild itself with the regional boss Kanemaru, but he has a difference of opinion with Reiji, who recommends Taiga to be the next president. A crack appears in the monolithic unity of the family. In addition, the four families in Tokyo, which had been united by the absolute presence of Gunji Washio, lose control.

The Naito-Shinjuku family has been divided into two factions: the faction lead by Reiji, who proposes Taiga as the next president; the faction lead by Akira Shiba, trying to rewrite history by putting Kanemaru on the spot.

As the family war becomes increasingly chaotic, Reiji is defeated by Kanemaru during a duel. In the midst of all this, Hideyoshi Okami steadily builds a relationship, and the chaotic intensifies...

The Naito-Shinjuku family is an organization where only the Washio bloodline can inherit the head of the family. In order to achieve his destiny and cause, Tomonori Kanemaru set the Naito Shinjuku family in fire and committed suicide by burning himself to death. Reiji proposes Taiga as the next president and tries to rebuild the family, but the situation worsens with the appearance of Ogami Hideyoshi, the Naito Shinjuku family's former boss' assistant who was released from prison...