Is Mission-E hentai?
No
Rated PG (Children) on MyAnimeList and not tagged as Hentai.

TV · 2008 · 12 episodes · PG - Children
Action, Comedy, School, Sci-Fi
Chinami and her friends have formed an organization called OZ, with the financial backing of the Kujo Group. Their goal is to peacefully integrate people with Type-E abilities into society, and oppose the Foundation, an organization which seeks to capture and control Type-E users for their own mysterious purposes. (Source: ANN)
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