Ryokan Sankai
旅館山快りょかん さんかい
A small sulfur-spring ryokan in Nasu-Yumoto with kakenagashi baths
Day Use
YesLast entry for day-use bathing is 14:00, and visitors may be turned away if it's busy.
600 yen for adults, 300 yen for children, free under age 4. A towel set (bath towel and face towel) is 200 yen extra. Day-use guests can also book one of the two private baths for 1,000 yen per group, limited to 50 minutes.
Bathing & Water
Uses natural hot spring water
Enclosed indoor bathing area
Bathing Arrangements
A private bath you can reserve for yourself or your group
Free for overnight guests (50-min slots, no reservations taken); 1,000 yen per group for day-use visitors. One guest review notes solo use of the private bath is generally not permitted.
Shared bathing area for all genders
Policies & Services
Welcomes children and families
A restaurant or dining room open to visitors, not only meals for overnight guests
Meals are served in-room to lodging guests only; no public dining area for day-use visitors.
Shower, wash stations, soap and shampoo provided
Bath amenity list implies washing area with shampoo/conditioner/body soap; consistent with a review noting three showers.
Towels to rent or borrow at the desk
Programs
About
Ryokan Sankai is a small, seven-room inn in Nasu-Yumoto Onsen where the baths were rebuilt in 2024. The water, a mix of the Shika-no-yu (鹿の湯) and Gyounin-no-yu (行人の湯) springs, is cloudy white and clearly sulfurous, with guests often noticing the smell from the entrance. It runs kakenagashi, drawn straight from the source and left to cool naturally rather than being recirculated. The shared bath alternates between men and women on a set schedule, and there are two private baths, free for overnight guests and available for a fee on day visits. Meals are served in the room rather than in a dining hall, and with only a handful of rooms the inn stays quiet even at full capacity.
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Last updated September 29, 2026