Philosophy & Research
For me, kinbaku is not a technique for restraining a body.
It is the act of understanding a body, understanding a person, and drawing out the life of that person with rope.
This is why beauty and safety are not two separate things.
Safety begins before the first rope is placed: by designing the tie to reduce foreseeable risk from the outset.
I have worked professionally as a dominatrix since 1991, and I have practised and taught kinbaku for a quarter of a century.
Lineage
I began studying kinbaku seriously at the end of 2001, at Mistress, a long-established SM bar in Roppongi. I learned there until I could perform. In 2004 I was accepted as a student by Randa Mai (1959–2022). In 2012, during his lifetime, I received his name as the second generation.
What I received from my teacher was not a sequence of knots. To look at the body of the person in front of me. To leave space, using few ropes. Never to turn a bound person into a doll.
He compared the kinbakushi to the unobtrusive supporting presence in bunraku. The rope is not the subject. The person receiving it is.
The rope is not binding someone. It is releasing their heart.
I carry this as a single line: bind the body, release the mind. And I keep one more of his principles — not a single rope that exists only for decoration, not one rope without a function.
The naming
The ceremony was held on 25 March 2012, at Casablanca Shinjuku. That is my teacher’s birthday.
Why I came back
In 2020, at fifty, I announced my retirement from SM and closed every part of my work.
In 2022, my teacher died.
I returned. Not for myself. To take what I had received from him, put it into a form that will survive, and hand it to the people who come next.
At the same time, women who wanted to learn came to me, and I took on their training as dominatrices.
Everything I do now begins here. What is inherited disappears unless the person who inherited it passes it on. I am writing Kinbaku-gaku to put practice into words that can be examined. Randa-ryu Kinbaku Juku, which I opened in 2024, is a revival of Randa Juku, the school my teacher ran around 2005 — the name and the teaching are not my invention; I was holding them, and I have opened the doors again. At La Cage I continue to train dominatrices.
In 2022 I also founded two. Inc. Its purpose is to support sex workers in building second careers; the café Inclusion and the training gym Secure Base exist for that. To me this is the same work as the rest. Making the road I walked passable for the people coming after me.
Kinbaku. The craft of the dominatrix. And what happens to the people who walk this road afterwards. The three things I carry are now doing one and the same thing. Handing them on.
A body is not an object
The body is not something to fit into a predetermined tie. The tie must respond to the body.
The person receiving the rope is not material to be bound. They are a participant in the design. Range of motion, musculature, the condition of that particular day — every body differs. So I do not decide the shape first and fit the body into it. I read the body in front of me, and then I place the rope.
When the other person lets go of everything and becomes completely relaxed — that is when it is most beautiful, and most safe.
That beauty and safety occupy the same place is not a metaphor. A body held rigid by fear is dangerous, and it is not beautiful either.
Safety by Design
Safety is not only about responding to danger. It begins with how the tie is designed.
Most safety teaching follows one sequence: danger occurs, you notice it, you release. That sequence is necessary. It is not sufficient. My question comes earlier. Can the tie be built, from the beginning, so that load does not concentrate where it is dangerous?
Load can be distributed
When a body is suspended, its weight does not have to rest on a single point. In my own practice I build support points in sequence — upper limbs, thighs, and last the hips — placing the heaviest part of the body last, so that the load carried by the arms is deliberately reduced. None of this is visible as spectacle. But this is where it is decided what happens to the body.
Copying the form does not copy the safety
Two ties can look identical and be entirely different in how safe they are. Reproducing a shape from a photograph does not reproduce the design that was in it. Knowing something and being able to build it are not the same thing.
Rules as the foundation, observation on top of it
I do not trust safety that depends on observation, because human attention varies with the day. So I put rules at the foundation, and place observation on top of them. Observation is allowed to shorten a tie. It is not allowed to extend one.
For example: when a form is complete, I bring the person down. We photograph it, or we show it to the audience, and then it comes down. Not because something happened. Taught as a habit — because a habit like that helps prevent a tie from continuing longer than intended. Acting once you have spotted a warning sign is already late. The design should have ended before the sign appears.
My own accident
When I was about thirty-three, I caused radial nerve palsy in a person I had tied. At the time, not one of us in that room — myself included — noticed anything was wrong.
I do not speak about safety design because I have never caused harm. I speak about it because I have.
What that experience taught me is that attention alone was not a sufficient safety system. It became one of the starting points for thinking about safety as design.
Kinbaku-gaku
I am writing Kinbaku-gaku: Technique, Beauty and the Body in Japanese Culture, to be published in 2027. It is neither a photo collection nor a technical manual. It is a research project that takes a long practice and puts it into a form that can be examined — and a way of keeping what I was given from disappearing.
Fragments of information and rules of thumb are not enough to protect a body.
Kinbaku has been transmitted from teacher to student, body to body, for a long time. That method has real value. But it also carried forward, undifferentiated, what was evidence, what was habit, and what was simply a misunderstanding. This book organises the field through four lenses — history, philosophy, anatomy and safety design — to present kinbaku as a Japanese physical culture with structure. It carries expert supervision, the reasoning behind its safety recommendations, a bibliography and a defined vocabulary.
Current research questions
My current work examines whether the safety of kinbaku can be described more precisely through time, load, structure, and rules defined in advance. Three questions in particular: whether a duration for continuous suspension in normal practice can be described as a number; whether the two-layer structure — rules as foundation, observation permitted only to shorten — can be made teachable; and whether the force that supports and the force that is applied can be treated as distinct, including the general principle that constricting force has no upper limit set by body weight. These are open questions, not conclusions. Prior work, if it exists, would be welcome.
Where I draw the line
I am not a physician. Where my work touches medicine, I distinguish practitioner observation from medical knowledge, and I seek specialist review. For Kinbaku-gaku I have asked specialists — including a physician specialising in peripheral nerves — to supervise the relevant material. What I have is a long record of placing rope on human bodies and observing what happened and what did not. That is not medical proof, and I do not present it as such. Keeping that distinction visible is, I believe, what this field needs.
Teaching
I lead Randa-ryu Kinbaku Juku in Tokyo. The grades are named for what kinbaku is meant to develop. The entry level, Kizuna-Shodo, joins kizuna — a strong bond and relationship of trust between people — with the beginning of a path. The advanced level, Kizuna-Tatsunawa, refers to those who have reached both technical and inner depth through rope.
What I teach is not shapes. It is the ability to explain why a shape is what it is.
In 2012, the year I received my teacher’s name, I founded Seijoukai for public education on safe kinbaku. From 2014 accident prevention moved to the centre of my practice; in 2015 I started Seigaku, its teaching arm, and founded the BDSM Safety Support Association as a certified nonprofit corporation. The corporation was dissolved in February 2023, and its role has been carried forward into Randa-ryu Kinbaku Juku and Kinbaku-gaku. The purpose has not changed: to keep kinbaku from being sealed inside a purely sexual frame, and to make safety something that can be discussed as culture.
Workshops and lectures outside Japan
I accept invitations for teaching, lecturing and performance internationally. Randa-ryu Kinbaku — the technique of the school and the design thinking behind it. Kinbaku Anatomy & Safety — understanding the body and designing for safety, available as a lecture with no practical component where that is preferable. Japanese Kinbaku: Philosophy, Body and Communication — kinbaku as Japanese culture. Each can be built as a combination of lecture, hands-on workshop and performance. Equipment, venue conditions, participant level and interpretation are agreed in advance.
What I do not claim
International credibility is decided as much by what a person declines to say as by what they say.
I am not a physician, and I do not present practitioner observation as medical knowledge. I do not call myself the best in the world. I do not present as established fact anything that has not been established. I do not try to demonstrate artistic merit through difficulty or through the height of a suspension. I do not rank the methods of schools I have not practised.