Is Aratanari Fukaki Ao hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2012 · 10 episodes · PG-13 - Teens 13 or older
Slice of Life
A short anime series that describes the everyday life of Ao and other Eureka Seven Ao characters.
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