Is Kuroko no Basket 3rd Season NG-shuu hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 9 episodes · PG-13 - Teens 13 or older
Comedy, Shounen, Sports, Team Sports
Animated bloopers included with the Blu-ray/DVD releases of the Kuroko no Basket 3rd Season.
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