Bathing & Water
Uses natural hot spring water
Capabilities
Private bath available for day-use visitors or hotel guests to reserve
Private onsen bath in guest rooms, for overnight guests only
Site enumerates the entire onsen offering as two shared charter baths; standard room amenity list has no in-room bath. One review notes the room's private bathroom is explicitly not source (onsen) water.
Shared bathing area for all genders
Both baths are private/reservation-free charter baths used exclusively by one party at a time, not communal mixed bathing.
Policies & Services
Welcomes children and families
Rental baby bath/futon on the amenity list; corroborated by a Google review calling it a baby-friendly inn (赤ちゃんに優しい宿です).
On-site or nearby parking available
About
Soumeian is a small ryokan in the Kusatsu onsen town, just four rooms, built around two private charter baths instead of a shared bathhouse: Tanzaku-no-yu (短冊の湯) and Origami-no-yu (折紙の湯), both fed by the strongly acidic Bandaiko (万代鉱) spring. The water is clear and colorless, with the light sting you'd expect from an acidic source. There's no booking system: whichever bath is free is yours, and you can go back as many times as you like during your stay. It's a breakfast-only inn, no dinner is served, so evenings are for eating out in Kusatsu and mornings are for a slow breakfast built around Gunma ingredients; stay two nights and a Chinese-style breakfast is offered as an alternative. The inn was recently renovated and keeps baby baths and futons on hand for families traveling with small children.
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Last updated July 30, 2026