Kaigetsukan
海月館かいげつかん
Seafront ryokan with sky-view outdoor baths over the Kitan Strait
Day Use
Yes¥2,000 regular season; summer hours and prices differ
Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Sauna room of any kind
Bathing Arrangements
A private bath you can reserve for yourself or your group
Private onsen bath in guest rooms, for overnight guests only
Shared bathing area for all genders
Policies & Services
A restaurant or dining room open to visitors, not only meals for overnight guests
Shower, wash stations, soap and shampoo provided
Towels to rent or borrow at the desk
On-site or nearby parking available
Views
SeaAbout
Kaigetsukan (海月館) sits right on the Sumoto waterfront, and the baths make full use of the location. The sky-view rotenburo called Shiosai-no-yu (潮騒の湯) looks out over the Kitan Strait, and the indoor large baths for men and women share the same sea-facing outlook. A sauna is available in the bathhouse as well. Guests staying in the Tenkai Bettei (天海別亭) annex get access to a private reserved bath with the same sea view, and select rooms come with their own in-room bath. Day-use bathing is available in the regular season.
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Last updated September 19, 2026