Kadoya Ryokan

An old, three-storey concrete ryokan at Itamuro Onsen (板室温泉) in Nasushiobara. Reviewers say the water is the reason to come: the tubs are split by temperature, so you can pick the one you like, and another bath is kept lukewarm for people who like a slow soak. The building is Showa-era retro and run-down in places, and some visitors say only part of it was in use. Staff are described as friendly. The inn is listed as temporarily closed and nothing confirms a reopening date, so call before you go.