It's like a day trip hot spring with a hotel attached. Is it just the open-air bath, a pale red bath with an earthy feel? There was hot boiled water and lukewarm water. In addition to the hot springs, there is also a bedrock bath, and you can enjoy watching plays. For meals, there is a cafeteria, so you don't have to make a reservation, but you can also book a set meal or a kaiseki meal. However, since you can't enter the hot springs late at night, there may not be any point in staying overnight just for the hot springs. I stayed in a room with no explanation, and I think it was due to the boiler in the bedrock bath, but during the business hours of the bedrock bath, the room was quite hot. The air conditioner doesn't seem to be working, and the windows don't open, so it can be tough in the summer. After the bedrock bath business hours are over, it becomes a normal room.
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