Tsukasa Kiriki, the only son of a wealthy family, runs away from home because he admires the legendary delinquent Murakoshi, who has helped him since he was a child. He runs away from home and volunteers to join the "BEAST", the strongest team in the warring tribes era, but is turned away and meets Yoji Kawanaka on his way out. Yoji, together with Hisao Nakamura and Eiji Iwami teach Tsukasa how to be a delinquent, and the four become friends. Toshi, the seventh generation of the weak “Gokurakucho” team, asks them to join him in his fight against the “Hiroshima Night's”. Trying to avoid a fight, former Knights executive Hisao goes to see the head of the Knights, Hiro, and is wounded. Angry Tsukasa and the others are ready for the fight, and the battle between the Knights and the Gokurakucho begins.