Is Zoku Natsume Yuujinchou: 3D Nyanko-sensei Gekijou hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2009 · 5 episodes · G - All Ages
Comedy
Short 3D Nyanko-sensei animations bundled on BD/DVD's of the Zoku Natsume Yuujinchou series.
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