御客屋旅館
(ごきゃくやりょかん)
Uses natural hot spring water
Okyakuya Ryokan, Kurokawa (Pt.3 - private baths) No extra charge for private baths. If they're free, you can go in. I didn't test these private ones myself - can't say anything about them, they looked standard. A water composition chart was in only one of them.
Okyakuya Ryokan, Kurokawa (Pt.2 - second set of M/F baths) After the gender swap you can access three more baths as in the photo. One separate outdoor bath with a section deep enough to stand in and wooden beams. Two others are accessible from one changing room - an indoor and another outdoor one smaller than the separate one. Water quality is generally the same as described in part one of the review.
Okyakuya Ryokan, Kurokawa (Pt.1 - first set of M/F baths) Booked it as a ryokan. Liked everything - the service, dinner taste, location, baths. Day-use is available, included in the pass. On the first day there was an outdoor and indoor bath as in the photo. Water in both is clear, medium-hot, mostly no smell. To reach the outdoor bath you go outside and walk along with a great view of lanterns and the river; the outdoor bath itself is standard by Kurokawa standards. The indoor bath is pretty simple. Recommended.