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

ONA · 2024 · 3 episodes · PG-13 - Teens 13 or older
Haru, a free-spirited skater, has always felt like a misfit in a world where she's constantly told how to behave. One day, Haru meets T.K., a mysterious man sitting next to a vending machine, waiting for someone to appear. (Source: Azuki YouTube Channel)
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