Is Kobato.: Hajimete no Kobato. hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2010 · 8 episodes · G - All Ages
Comedy, Drama, Supernatural
Mini Flash anime from the limited-edition DVDs volumes (episodes 1-6) and Blu-ray Box (episodes 1-8, of which 7 and 8 were new additions to the Blu-ray box).
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