Inyouchuu Shoku: Ryoushokutou Taimaroku, episode 01 RAW

An endless nightmare unfolding on an isolated island.

During the summer vacation, a request for extermination of a demon was sent to the Demonya Honpo Black Cat Branch.
On a certain isolated island, many tourists are in “Kamikushi”. He wanted you to get rid of the cause of the demon.
So, Shinkin, Take, and Mizui went to a solitary island.
The three people who arrived at the destination island were guided to the mansion of the client, the island chief, and exterminate the demon from there.