Hotel Kasuien

Hotel Kasuien is located in Ureshino Hot Springs, Saga Prefecture, Kyushu.

This hotel prides itself on the quality of its hot springs, which are known to be one of the top three skin rejuvenating waters in Japan, as well as its Kaiseki cuisine, made with the freshest ingredients.

In ZLS
This was the hotel where Franchouchou stayed after the concert and collaboration with the pharmacist in episode 4.