Is Sekirei: Pure Engagement Episode 0 hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2010 · 1 episodes · R+ - Mild Nudity
Comedy, Ecchi, Harem, Seinen
Episode 0, consisting of two subepisodes: "Sekirei Shindan" (鶺鴒診断) and "Sekirei Yoka" (鶺鴒余暇), of Sekirei: Pure Engagement included on the first DVD/BD volume.
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