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

ONA · 2020 · 13 episodes · PG-13 - Teens 13 or older
Comedy, Otaku Culture, Seinen
Short episodes with super-deformed characters posted in official Twitter account and later released with the BD Box. Includes one recap episode of the first 4 episodes of the main series
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