Is Aharen-san wa Hakarenai Mini hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2022 · 18 episodes · PG-13 - Teens 13 or older
Comedy, School, Shounen
Mini anime for Aharen-san wa Hakarenai released on the official Twitter.
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