Is Busou Shinki Moon Angel hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2011 · 10 episodes · PG-13 - Teens 13 or older
Action, Sci-Fi
The story follows the coming of age and Shinki battles of Tsubasa, a boy who dreams of becoming a Shinki Master, and his Shinki partner Arnval Mk. 2. (Source: ANN)
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