Is Nuwa Chengzhang Riji hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2016 · 30 episodes · PG-13 - Teens 13 or older
Comedy, Fantasy
This story follows an orphan girl rumoured to be a successor of "Nuwa", the goddess of creation in ancient Chinese mythology.
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