Joe Yabuki has learned how to toughen up and stop trusting others after a troubling youth spent bouncing between orphanages and fending off bullies. After finally escaping the cycle of violent temporary homes, Joe adopts a delinquent lifestyle in the streets of San'ya, a slum in Tokyo. He makes his way through the world with his fists, picking fights with anyone he pleases. Danpei Tange, a washed-up and alcoholic former boxing coach, notices Joe's animalistic combat ability and attempts to ment