Is Mikakunin de Shinkoukei: Mite. Are ga Watashitachi no Tomatteiru Ryokan yo. hentai?
English title: Engaged to the Unidentified Special
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, Romance
After participating in a lucky draw, Hakuya Mitsumine wins first prize: tickets for a trip to a hot spring of his choice. Hakuya's sister, Mashiro, wishes to visit a specific hot spring in a village surrounded by intriguing rumors about alleged sightings of mysterious creatures in its area. Supportive of his sister's pick, Hakuya, along with Mashiro and a few friends, heads to the village. When the group ventures into a dark forest determined to catch a glimpse of the creatures, their pursuit is instead hindered by multiple uncanny mishaps. Strayed from what was supposed to be a simple goal, the group is determined to find the creatures or else they will return home with their curiosity dissatisfied. [Written by MAL Rewrite]
View on MyAnimeList