18+ Isuca: Gokuraku

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.