Is Kidou Senshi Gundam 00: Tenshi-tachi no Kiseki hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2008 · 1 episodes · PG-13 - Teens 13 or older
Mecha, Sci-Fi
A recap of the first season, from Setsuna's point of view.
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