Ryoo Tachikawa, a member of the Yokohama St. John's Academy boxing club, turns professional and aims to be at the top of the world. Meanwhile, Genkai Gen, the son of the Honmoku Kento Club to which Ryoo belongs, is a high school student, but he conquers gangs one after another and aims to become the pinnacle of evil. The original author, Ryu Setoki, is an alias of Satoshi Kariya, who is well-known for ``Oishinbo''.