Is Kuroko no Basket 2nd Season NG-shuu hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 9 episodes · PG-13 - Teens 13 or older
Comedy, Shounen, Sports, Team Sports
Animated bloopers, based on the extra section of the original manga series, included with the BD/DVD series for Kuroko no Basket Second Season (both limited and normal editions).
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