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

Special · 2018 · 15 episodes · PG-13 - Teens 13 or older
Comedy, Shounen
Petit Clover Specials included in the Black Clover Blu-Ray Volumes.
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