I went to "Seijakubo" in Tokachigawa Onsen, Hokkaido.
All rooms have open-air baths fed by natural hot springs, and the hot springs are mall hot springs, which is rare in Japan. Although it is a new inn that opened in 2022, it has a very good reputation.
*Information as of August 2024
*Photo taken with permission
time table
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0:00 Ending
2:43 Room tour
9:18 Stroll
11:34 Dinner
14:23 Breakfast
15:48 Closing
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[Seijyakubow]
https://seijyakubow.jp/