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

unknown · PG-13 - Teens 13 or older
Adventure, Comedy, Shounen
Sequel to Dr. Stone: Science Future Part 3, adapting the one-shot chapter included in volume 27 of the original manga.
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