Is Nakanohito Genome [Jikkyouchuu]: Knots of Memories hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2020 · 1 episodes · PG-13 - Teens 13 or older
Adventure, Drama, Mystery, Video Game
An original story included with volume 10 of the Nakanohito Genome [Jikkyouchuu] manga.
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