Keiō Takaosan Onsen Gokurakuyu 京王高尾山温泉/極楽湯
Onsen at Takaosanguchi fed by a spring 1,000 m deep; Saturdays and public holidays 1,300 yen.
A hot-spring bath complex opened on 27 October 2015 beside Takaosanguchi Station. It is the most convenient bath after the descent from Mount Takao.
Tokyo
Takaosanguchi, Kiyotaki
https://theanimetrip.com/luoghi/keio-takaosan-onsen-gokurakuyu