Is Hajime no Ippo: Boxer no Kobushi hentai?
English title: Fighting Spirit Special
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2003 · 1 episodes · PG-13 - Teens 13 or older
Combat Sports, Shounen, Sports
A special episode included in the DVDs. It tells the story of how Takamura started boxing.
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