Gyoja Minshuku Taiyo no Yu

Taiyo no Yu is a small family-run minshuku in Totsukawa Onsen, sharing the ground floor of its building with a local day-service centre. It has several baths, a rock bath, an iron kettle-style bath called goemonburo (五右衛門風呂), and an open-air bath overlooking the river and mountains, and each one is run as a private, reservable room rather than a shared communal bath; day-use visitors can book the same way, by the hour. The water comes from Totsukawa's shared hot-spring source, kept flowing fresh, with a faint sulfur smell and a slightly silky feel on the skin, and several guests mention it arrives quite hot before it's cooled for bathing. It's a small, unpretentious inn: reviewers mention a chatty, welcoming proprietress and a hearty dinner built around local ingredients like wild boar hot pot.