Is Honoo no Tenkousei hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 1991 · 2 episodes · PG-13 - Teens 13 or older
Combat Sports, Comedy, Parody, School, Shounen, Sports
Transfer student Takisawa Noboru quickly learns that all disputes at his new school are settled in the boxing ring. Now he finds himself in a series of showdowns with the local top dog, Ibuki Saburo, for the love and respect of the beautiful Yukari. (Source: ANN)
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