Is GA: Geijutsuka Art Design Class - Aozora ga Kakitai hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2010 · 1 episodes · PG-13 - Teens 13 or older
CGDCT, School, Slice of Life, Visual Arts
GA: Geijutsuka Art Design Class OVA. "I Want to Draw the Blue Sky"
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