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

TV · 2020 · 12 episodes · PG-13 - Teens 13 or older
Anthropomorphic, Comedy
It's a "pop" and cute everyday anime based on the 4-koma manga featuring the characters from Uma Musume: Pretty Derby.
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