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

TV · 2023 · 12 episodes · PG-13 - Teens 13 or older
CGDCT, Comedy, Idols (Female)
Short anime based on the 4-koma series illustrating the daily lives of the Nijigasaki High School Idol Club’s members.
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