Uses natural hot spring water
Site states a private source (対馬40号) feeding a natural alkaline simple spring (rotenburo kakenagashi, indoor bath heated/recirculated); one 2026 Google review guessed the indoor bath water 'felt like plain water' (アルカリ性単純温泉ぽいのであまり温泉に入った感じはない) — kept the official spring analysis over the impression.
Open-air outdoor bath
Enclosed indoor bathing area
Dry heat sauna room
Cold water plunge bath, typically used after sauna
Shared bathing area for all genders
Bath rules refer to separate men's/women's ('opposite-sex') areas with an under-7 exception, implying standard gender-separated baths, not mixed bathing.
Allows entry with visible tattoos
Welcomes children and families
Children 6 and under may bathe with a parent in the opposite-sex area; 7+ must use their own gender's bath. Guests still in diapers may not use the large bath at all.
Restaurant or dining open to visitors (not just hotel meal plans)
A dedicated restaurant venue (not just in-room dining), though buffet times are geared to overnight guests; no evidence it accepts walk-in day visitors.
Shower, wash stations, soap and shampoo provided
Towels available to rent or borrow
No towels supplied/rented at the bathhouse; guests bring their in-room towel instead.
On-site or nearby parking available
The rotenburo here is kakenagashi, fed straight from the hotel's own spring (Tsushima No. 40, 対馬40号), with a view over the Izukogen hills and the Sagami Sea; cherry blossoms hang over it in spring, fishing boats light up the water on summer nights, and there is a morning bath looking toward Oshima at sunrise. Next to it is a compact sauna with a cold plunge, and an indoor bath (heated and recirculated) with big windows for an unhurried soak on a rainy day. The water itself is a mild alkaline spring, used without dilution, and gentle on the skin even after a long soak. The hotel started out as a resort condominium; the renovated rooms are kitchen suites rather than standard hotel rooms. Beyond the bath, named Izumi Tenku no Yu (泉天空の湯), there is an indoor pool, table tennis, billiards, and a karaoke room. Bathing is separated by gender, though parents may bring a child of six or under into the opposite side.
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Last updated July 30, 2026