Is Chou Futsuu Toshi Kashiwa Densetsu R hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2020 · 10 episodes · PG-13 - Teens 13 or older
Comedy, Fantasy
A gag anime set in Kashiwa, featuring high school girls and mysterious creatures. (Source: Chou Futsuu Toshi Kashiwa Densetsu Wiki)
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