From Kodansha:
A young drifter named Joe Yabuki wanders through the slums of Tokyo, but when the local ruffians try to give him a hard time he teaches them a rough lesson with his fists. The spectacle sparks a gleam in the eye of an old drunk who happens to be watching: Danpei Tange, a failed boxer and former coach, who sees something special in the boy. He pleads with Joe to…