Is Kimi ga Nozomu Eien Special hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2004 · 1 episodes · R+ - Mild Nudity
Comedy, Mecha, Parody, Sci-Fi, Space
Kimi ga Nozomu Eien parodying the Gundam series in two minutes.
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