Is Isuca: Gokuraku hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2015 · 1 episodes · R+ - Mild Nudity
Action, Comedy, Ecchi, Harem, Mythology, Romance, School, Seinen, Supernatural
Shinichirou Asano, Sakuya Shimazu, and their friends arrive at one of the Shimazu family's private islands for a vacation. However, what starts as a fun and relaxing outing soon takes a turn for the supernatural when the group heads into the island's forest. As their companions mysteriously vanish one after the other, Shinichirou and Sakuya quickly find themselves all alone on a seemingly uninhabited island. [Written by MAL Rewrite]
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