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

ONA · 2021 · 24 episodes · PG-13 - Teens 13 or older
Comedy
Mini series for the anime Tokyo Revengers released on anime's official YouTube channel. The specials are directed by Minoru Ashina and follow the day-to-day activities of the various characters.
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