Is Tonari no Seki-kun Specials hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 2 episodes · G - All Ages
Comedy, School, Seinen
Two unaired episodes included in the DVD Set release of Tonari no Seki-kun series. #1. Field Trip (Rinkan Gakkou) (first volume) #2. Snow Playing (Yuki Asobi) (second volume)
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