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Masu Seiya 益成屋
Kusatsu, Gunma · Private-bath facts checked on the official website: ekinariya.com ↗ · last verified 17 October 2026
Does Masu Seiya have a private onsen?
Yes. Masu Seiya in Kusatsu has 4 private (kashikiri) baths that one group at a time can lock and use. It does not state a tattoo policy. Anything a website does not state is marked not confirmed. Compare the same room on Agoda, Trip.com and Booking.com, including taxes and cancellation terms. Checked on its official website on 17 October 2026.
Last verified · How we verify · Open data
What private baths does Masu Seiya have?
| In-room open-air bath | Not confirmed |
|---|---|
| Private (kashikiri) baths | Yes, 4 baths source ↗ |
| Private bath fee | Not confirmed |
| How to use the private bath | Not confirmed |
| Spring water | Not confirmed |
| Tattoos: private baths | Not confirmed |
| Tattoos: shared baths | Not confirmed |
| Children | Not confirmed |
| In-room dining | Not confirmed |
| Day-use private bath | Not confirmed |
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Masu Seiya on Rakuten Travel
- From ¥18,850 per room per night: Rakuten's lowest-rate estimate for its cheapest plan (which may be for one guest without meals), including tax and service charge (as of )
- Guest rating 4.71 out of 5 from 298 reviews on Rakuten Travel
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About Masu Seiya
Masu Seiya (益成屋) is a ryokan in Kusatsu, in the Kusatsu area. This page sums up what its official website says about private bathing, so you can see at a glance whether it suits a couple, a family or a guest with tattoos.
There are 4 private (kashikiri) baths that one group at a time can lock and use. The website doesn't explain how slots work, so ask at check-in. We found no mention of rooms with their own open-air bath, so the private bath is the way to bathe alone here.
The website doesn't state a tattoo policy. If that matters to you, email the property before booking.
Anything marked 'not confirmed' below, such as in-room baths, the water source and tattoo rules for private baths, wasn't stated on the pages we checked. That doesn't mean the answer is no, only that we haven't assumed one. We checked the official website on 17 October 2026. Rules and fees change, so confirm with the property, and use the buttons above to compare the same room across booking sites, including taxes and cancellation terms.
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