Yudanaka Seifuso

Yudanaka Onsen Seifuso is a conveniently located inn just a 2-minute walk from Nagano Dentetsu Yudanaka Station, and it’s especially appealing for hot spring lovers. In the free-flowing open-air bath, you can enjoy a drink while soaking—something many people dream of trying. Even more luxurious: after 23:00, if there’s availability, the open-air bath can be reserved for private use for free. This is perfect for couples or families who can’t easily bathe together at home, and anyone who wants to experience the indulgence of a private natural onsen. If you want to use it privately, be sure to ask when you book. Other bath highlights include a 400-year-old Kiso cypress bath and an apple bath with real Shinshu apples floating in the water. The inn has just 12 rooms across the main and annex buildings, giving it a calm, intimate atmosphere. Note that some rooms reportedly do not have private toilets, so if shared facilities are difficult for you, confirm before booking.