Hajime no Ippo: Boxer no Kobushi

Both are special episodes from anime series that are about boxing. Both of these anime have an old boxing coach who finds a talented young delinquent and turns him into a professional boxer. Takamura and Joe also share some characteristics: they both are brash, loudmouthed delinquents who are very strong and have a natural talent for boxing. Both of these anime show their early steps into the boxing world, their initial training and their early matches. 

Both are sports anime that focus on boxing. Also, the main characters, Joe and Takamura, are quite similar. They are both brash and strong delinquents, with a natural talent for boxing. Both are discovered by an old boxing coach. Both anime show these main characters go from street urchins to great boxers.