Is Celia-sensei no Wakuwaku Magical Kyoushitsu hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2021 · 18 episodes · PG-13 - Teens 13 or older
Comedy, Fantasy, Isekai, Reincarnation
Informational mini anime posted on the anime's official Twitter and HJ Bunko/HJ Novel's official YouTube channel.
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