Uses natural hot spring water
544. Yutopia, Kai, Yamanashi A wild hotel with a radioactive onsen. In the lobby there's some kind of crazy machine, a large cage with a sleeping cat, and a shop selling retro stuff. Visited for higaeri at 880. Higaeri hours are listed as 10:00 to 23:00. They stamp the Yamanashi 100 Onsen book. Bath photos are from the internet, match the real thing. 1. Indoor area. Breathing inside is good. 1.1. Bath with clear slightly yellowish water. Has utaseyu. Temperature around 39-40. 1.2. Cold bath. 2. Indoor area within the indoor area. There's a separate staircase and a sealed door leading to the radioactive section of the onsen. Inside, everything is covered with posters in Japanese, one of them has a medical "+" symbol. Inside there's a bath with clear slightly yellowish water, temperature around 40, with occasional individual bubbles. It's stuffy inside. I think the onsen at Black Mesa in Half-Life looked exactly like this. Very unusual, strange place. For people with radiophobia — better stay away. 11.05.2025