Matsuda Ten, 17 years old, aims to become the number one gangster in Japan. In an attempt to win over his admired big brother, Centipede Nishikizo, a member of the Kamigata-kai, he offers up his runaway daughter, Natsu, but is found out by Nishikizo's older sister and fails. He is forced to start a gang war with Natsu, but is then found out and beaten up by the young men of the Oichi-gumi, which is in an antagonistic relationship with the Kamigata-kai. When Ten finally becomes a member of the Kamigata-kai, Nishikizo is killed by the Oichi-gumi's subordinates due to his pathological womanizing. The Kamigata-kai and Oichi-gumi enter into an all-out war. On his first visit, Ten and Nishikizo storm into the mistress' house of the head of the Oichi-gumi, but his clumsiness misses the life of Oichi...