Bathing & Water
Uses natural hot spring water
Official site tagline also states 天然温泉 (natural onsen).
Enclosed indoor bathing area
Two indoor bath rooms (Western stone-built and Japanese cypress style) swap between men's and women's use daily.
Sauna room of any kind
Cold water plunge bath, typically used after sauna
Bathing Arrangements
Shared bathing area for all genders
Policies & Services
Allows entry with visible tattoos
Consistently confirmed across multiple reviews (2022: 'They welcome people with tattoo'; 2026: '墨が入ってる人には最高な場所！制限がないから'). No official statement found on the site; an unrelated hallucinated aggregator claim was discarded after verification.
Restaurant or dining open to visitors (not just hotel meal plans)
Official site also lists a お食事 (dining) page and a snack/tea lounge corner.
Towels available to rent or borrow
Towels are sold, not rented (also matches a 2020 review: 'Bring your own towels').
Programs
About
Megumi-no-yu is a municipal day-use bath in the Isobe onsen area of Annaka, Gunma. The salty spring water fills two indoor bath rooms, one Western-style with stone tiling and one Japanese-style built in cypress, that swap between men's and women's sides each day, plus an outdoor bath, a sauna, and a cold plunge. A separate reservation-only room offers a sunajio-buro (砂塩風呂), a sand-salt bath where you're buried in warmed mineral salt. Reviews describe it as an easygoing, old-school local spot with a big tatami rest hall to stretch out in afterward, and it's known among visitors as welcoming to people with tattoos.
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Last updated July 22, 2026