Is Inugami-san to Nekoyama-san: Nekoyama-san to Onsen Ryokou hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Girls Love, School
Unaired episode bundled with the Blu-ray/DVD Box-Set.
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