Joe, a teenage orphan in the slums of the Doya streets, meets Danpei, a homeless, alcoholic ex-boxing coach. Danpei, seeing Joe's boxing talent, decides to train him. When Joe is sent to a terrible juvenile home for petty crimes, he meets Rikiishi who becomes his boxing rival. Danpei arrives at the home to help Joe to train in order to defeat Rikiishi. When Joe decides to seriously pursue boxing, Danpei cannot get a coaching licence because of his reputation as a drunk.

Source: AnimeNfo

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Sequel: Ashita no Joe 2
Summary: Ashita no Joe (1980)
Same setting: Futari no Joe
Other: Megalo Box