Is Cosplay Complex hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2002 · 3 episodes · R+ - Mild Nudity
Comedy, Ecchi, Otaku Culture, Parody, School
Every cosplay club in Japan shares the same dream: to take first place at the Cosplay World Series. East Oizumi Academy's club is no different; led by Gorou Yorozuyo, the club's members spend every moment training and preparing for competitions. Still, even with ace cosplayer Chako Hasegawa and the shape-shifting powers of the fairy Delmo on their side, the club must work hard if they want to become the best in Japan. [Written by MAL Rewrite]
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