One of the things nobody tells you about visiting onsen with a partner is that you do not actually go together.
You arrive together. You change into your yukata together. You walk down the corridor toward the bath together. Then you reach a sign, usually a simple noren curtain in two colours, and you split. One direction for women, one for men. You bow slightly, or laugh slightly, and disappear into separate worlds for the next 45 minutes.
This is the tradition, and it is a beautiful one. There is something about surrendering your usual social self at that curtain, entering a space where nobody knows who you are or what you do, and just being a person in hot water. I have come to genuinely love it.
But here is the small frustration that crept in over several trips. You have this extraordinary sensory experience, the minerals, the heat, the steam, the silence, and when you reunite afterward you try to describe it. I would say the water felt completely different today. Or, I think this spring is doing something strange to my skin. And Ryan would say the same. And we would piece together what we had separately experienced, like comparing notes from two different books.
At some point we started wondering if there was a way to have the experience together. It turns out there is.
Kashikiri means reserved or set aside exclusively. A kashikiri onsen is a private hot spring room rented for a set time, usually 45 minutes to an hour, for exclusive use by one group. It might be a couple, a family, or a small group of friends. The facility is yours entirely during that time: the bath, the changing area, sometimes a small adjoining rest room.
The water is the same spring water that feeds the communal baths. The mineral properties are identical. You are not getting a lesser version of the experience because you are not sharing it with strangers. You are simply having it in private.
Many ryokan across Japan offer kashikiri baths as part of their facilities, either included in the room rate or available at an additional charge per session. Some facilities specialise in nothing else. Yufuin in Kyushu, where the alkaline spring water sits at a comfortable pH 7.8, has several inns that are known specifically for their private outdoor baths. Nuruyu Onsen in Kyushu, with its gently alkaline water at pH 8.5, is another excellent option.
Communal bathing has its own quality. There is something grounding about sharing a bath with strangers, about being in a space where hierarchy and appearance and occupation dissolve in the steam. I genuinely value that experience.
But private bathing allows something that communal bathing cannot: you can actually talk.
In a shared bath, conversation above a low murmur is not the done thing. Eye contact with other bathers is kept minimal. You are present but also contained. This is part of the culture and I respect it completely, but it does mean that the onsen experience, for all its togetherness, is fundamentally solitary.
In a kashikiri, Ryan and I can sit in the water together and talk about the water. We can say, this feels different from last time, or the temperature here is gentler than Kusatsu, or I think this spring is doing something good for my skin. We can compare what we are noticing in real time instead of reconstructing it from memory over dinner. It turns out that discussing an experience while you are having it is a different thing from discussing it afterward.
Our first private bath in Hakone was at a ryokan near Miyanoshita. The bath was outdoor, set into a small stone terrace with a view of the forested hillside. The water was from the Miyanoshita spring at pH 8.4, slightly alkaline and very clear. The temperature was around 41 degrees Celsius. We stayed for close to an hour, which was longer than we had booked, and the attendant was gracious enough not to rush us.
I remember the silence of the forest and the sound of the water coming in and the smell of the minerals in the steam. I remember that Ryan had figured out something about the sodium chloride content of the spring and wanted to explain it to me, and for once I actually listened because there was nothing else to do. My skin afterward felt extraordinary.
I should mention that I have a small tattoo on my upper right back. It is not large, roughly the size of an eye patch, and it sits high enough that it is not visible in a regular neckline. In some public onsen I have passed through the shared bath without anyone noticing. In others the attendant has spotted it and, very politely, redirected me.
Japan's no-tattoo policy at many public baths applies regardless of size or placement. If a tattoo is visible while bathing, it is covered by the rule. This is not personal, and the staff handling it are almost always kind about it. But it does mean that for me, booking a kashikiri is sometimes the simpler choice even before considering everything else. I do not have to think about it. The space is private.
If you have visible tattoos and want to visit onsen in Japan, a kashikiri is the straightforward solution. You are the only person in the space. There is no policy to enforce because there is no one else to consider.
Some ryokan include kashikiri access as standard and specifically market to international visitors who may have tattoos. Others charge an additional fee, typically between 1,500 and 3,000 yen for a session, which is reasonable for an experience of that quality. It is worth asking at booking rather than at arrival.
Most ryokan that offer kashikiri list it clearly in their facilities section. The Japanese term to look for is kashikiri buro or kashikiri onsen. Some properties list it as family bath, which describes the same arrangement.
When you contact a ryokan in advance, the question to ask is: do you have a private hot spring bath available? Or, if you want to be direct: I have a tattoo and would like to arrange a private bath. Most ryokan staff who deal with international visitors are well accustomed to this request and handle it without awkwardness.
Booking time slots in advance is advisable at popular properties. The private baths are the first thing to fill on busy weekends. If you are set on the experience, secure it when you confirm your room.
The soak time in a kashikiri is the same as in a communal bath. Fifteen to twenty minutes is usually sufficient. The space being private does not make the water cooler or the heat less intense. The same rules about hydration and gradual entry apply.
Some private baths have a fill-as-you-go system where you control the water temperature yourself. Others are pre-filled and at a fixed temperature. If you have a preference, it is worth asking when you book.
The rest area adjoining many private baths, often just a small mat or a wooden platform outside, is genuinely useful. Lying down for ten minutes after a soak before getting dressed makes the rest of the day noticeably better. Do not skip it because you feel like you should be somewhere else.
For couples in particular, there is a specific kind of quiet that happens in a private outdoor bath in the mountains. You are in hot water, you are surrounded by trees or hills or whatever the landscape gives you, and there is no particular reason to do anything or be anywhere. Conversations happen or they do not. The silence is comfortable either way.
We started doing kashikiri partly out of practicality. We kept doing it because of what the shared experience turned out to be. The water is the same. But being in it together is not.
Ria Flores is an interior designer, Chief Design Officer, and frequent Japan traveller who has soaked in hot springs across Hokkaido, Tohoku, Kyushu, and Kansai. She writes about onsen culture from a traveller's perspective — practical, personal, and grounded in first-hand experience. She is the wife of SpringsAtlas founder Ryan Flores.
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