Is Gugure! Kokkuri-san Specials hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 11 episodes · PG-13 - Teens 13 or older
Comedy, Romance, Shounen, Supernatural
Short episodes included with the Blu-ray/DVD volumes.
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