Kusatsu Onsen SEN
草津温泉 千
Three private kashikiri baths at an adults-only Kusatsu ryokan
Day Use
NoBathing & Water
Uses natural hot spring water
Open-air outdoor bath
All 3 baths are half-open-air (hanroten), not fully roofed indoor tubs.
Bathing Arrangements
A private bath you can reserve for yourself or your group
Three private reservable baths (hinoki/rock/ceramic), included in the stay, lockable from inside.
Shared bathing area for all genders
All baths are private/lockable kashikiri baths used by one party at a time; no mixed communal bath is offered.
Policies & Services
Welcomes children and families
Adults-only policy: use is restricted to high-school age (roughly 15+) and above.
Shower, wash stations, soap and shampoo provided
On-site or nearby parking available
About
Kusatsu Onsen SEN is a small, adults-only ryokan (guests must be high-school age or older) built around three private baths: cypress, rock, and a one-person ceramic tub. Each bath locks from the inside, so it's just your group for as long as you want, and all three are half-open-air, so you get a bit of outside air and season while you soak. The water comes straight from the Mandaikou spring (万代鉱源泉) and runs kakenagashi, kept flowing rather than reheated or recirculated. It arrives properly hot, in real Kusatsu style, so guests often stir it (yumomi, 湯もみ) or add a little water before getting in. There are only 15 rooms, done in a quiet Taisho era style, and check-in and check-out are handled without meeting staff face to face, which suits a low-key couple's or solo stay more than a big group trip.
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Last updated September 19, 2026