Kumamoto — 黒川温泉
13 stays with a private bath · About 26 min by car from Akamizu Station, in the Aso mountains of Kumamoto
Every property listed here has a private bath — a reservable private bath or an open-air bath in your own room — so tattoos are a non-issue, and so is privacy.
Kumamoto · Getting there: About 26 min by car from Akamizu Station, in the Aso mountains of Kumamoto
Every room has its own indoor and open-air baths with free-flowing spring water, and the hilltop Tenku open-air bath can be reserved privately — free, 40 minutes at a time
Three private family baths — two open-air, one indoors — free for up to an hour, key from the front desk. Sources disagree on whether the water is fully free-flowing, so we make no claim either way
Each of the five detached villas has its own natural hot-spring bathroom and private sauna, usable around the clock. The official page mentions free-flowing spring water only in passing, so we don't promise it
Six private family baths in different styles — rock, cypress, standing, reclining — free, no reservation, open 24 hours. The water is 100% source spring, cooled rather than free-flowing
Four indoor private baths built of cut stone, ¥1,000 for 45 minutes, filled with free-flowing sulfur spring water from a 60 °C source
Two private family baths — one octagonal, one wider — with free-flowing spring water, cooled with a little added water; staying guests' first use is free, by reservation
Four detached private family baths in cypress or cut stone — first use free for staying guests, then ¥1,100 per room. The inn states the water is 100% natural spring, free-flowing, no artificial onsen
Eleven private baths, all free and no reservation — flip the wooden tag to 'in use' and walk in — and annex rooms with their own spring baths; every tub is fed free-flowing from the inn's own source
Two indoor private baths for staying guests only, both free-flowing spring water, inside a larger inn with four communal indoor baths and three open-air baths
Every cottage has its own dedicated bath — open-air or panoramic — fed straight from the property's own 59.7 °C source, never recirculated or reheated
All eight detached rooms have their own dedicated spring bath, each built differently, fed by free-flowing natural spring water (verified from Ikkyu, Jalan and Yahoo property data — the inn has no official site)
Two private family baths — 'Hikari' in stone with a view of the Kurokawa hills and 'Hana' in cypress — free for staying guests whenever free, around the clock
Every room has its own private onsen bath (some add an open-air one too) with simple sulfur spring water; the source runs too hot to use neat, so it is cooled with added water rather than free-flowing
Prices are a guide from rates checked on Klook in November 2026 and change by date and room type — always confirm the live price on the booking page.