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

TV · 2020 · 48 episodes · PG-13 - Teens 13 or older
Comedy, Strategy Game
The series revolve around a team of 12 high school students who love to play the trading card game Rebirth For You. (Source: ANN)
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