Is Genjitsu no Rimuru: Sunshine in the Slime hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2023 · 2 episodes · PG-13 - Teens 13 or older
Comedy, Fantasy, Isekai
A collaboration anime between Genjitsu no Yohane: Sunshine in the Mirror and Tensei shitara Slime Datta Ken.
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