Hoshizora no Yu, the bathing facility attached to Koumi Riex Hotel (Chateraise Gateaux Kingdom Koumi). Of the bath areas that alternate daily between men and women, only the Rock Bath side is equipped with a high-temperature sauna and a cold water bath. The spectacular view from the open-air bath at an altitude of 1450m and the star-filled night sky are truly wonderful, and you can enjoy an exceptional outdoor air bath. To top it all off, after bathing there is also the best reward of all: all-you-can-eat Chateraise ice cream.