Is Air Gear: Kuro no Hane to Nemuri no Mori - Break on the Sky hentai?
English title: Air Gear OVA: Black Feathers and the Sleeping Forest - Break on the Sky
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2010 · 3 episodes · R+ - Mild Nudity
Comedy, Delinquents, Ecchi, School, Shounen, Sports
First episode is based on the 16th volume of the manga. Features Ikki vs. Ringo. Second episode is based on the 23rd/24th volume of the manga. Features Kogarasumaru vs. Sleeping Forest inside Inorganic Net.
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