Is Megami Kouhosei Special Curriculum hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2002 · 1 episodes · PG-13 - Teens 13 or older
Mecha, Military, Sci-Fi, Space
A retelling of the TV series from the point of view of one of the Goddess Pilots. (Source: ANN)
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