What draws me to Sōsuishi-ryū is the honesty of its name. Most schools take names that promise something grand, a divine sword or a secret principle. This one tells you plainly what it is: kumiuchi koshi no mawari, grappling and the work around the waist. It is a school about what happens when the fight has already closed to the point where there is no room left to swing a long blade, and you have to deal with the man in front of you with your hands, your hips and a short sword. I find that directness appealing. It does not pretend the fight is elegant.
I am also drawn to where it sits in the larger family of Japanese grappling. Sōsuishi-ryū is not an island. It comes out of Takenouchi-ryū, the school usually called the oldest organised jūjutsu in Japan, and you can read that descent straight off the title. Koshi no mawari is Takenouchi's own term, and its survival in the name of a later Kyūshū school is the kind of small, concrete thread that I trust more than any sweeping claim of ancient lineage. When a school inherits a parent's vocabulary, it has usually inherited something real.
I have to be careful, though, about the founder. Futagami Hannosuke is a name with very little documented life attached to it. The school explains its own origins in its own way, and I have no wish to mock those accounts, but I cannot present them as history, because outside the tradition there is almost nothing to check them against. This is the ordinary condition of the koryū founders, and I have made my peace with it: the early generations of these schools are usually half in shadow, and a reference that pretends otherwise is not being honest. What I can hold on to is the shape of the art and the line it came from, both of which are better attested than the man.
The part of the story I find most reassuring is the geography. Sōsuishi-ryū is a Fukuoka school, and it has stayed one. That rootedness in a single domain, the Kuroda lands of Chikuzen, is the reason it is still here. I have come to think that the koryū which survived are very often the ones that were tied to a place and kept by it, rather than the ones that tried to conquer the whole country. Fukuoka kept Shintō Musō-ryū as well, the famous school of the staff, and there is something telling in the fact that the same domain held on to two such different classical arts. A region that values these things tends to keep them.
When I weigh what is known against what is merely traditional, the balance falls in a way I am comfortable with. The grand origin story I set gently to one side. The descent from Takenouchi-ryū, the character of the curriculum, and the long life of the school in Fukuoka I am happy to lean on. That is not a thin result. It tells me that an old grappling idiom, the close and structural fighting from which so much of Japanese jūjutsu grew, is still being taught in the same corner of Kyūshū where it took root.
What stays with me, finally, is the modesty of the thing. There is no famous duel here, no shōgun's instructor, no national organisation. There is a grappling school in Fukuoka that has quietly outlasted the world it was made for, carried by a handful of people who learned the forms from the people before them. I do not need it to be more than that. A short sword, a low stance, and the patience to pass the work on are enough to make it worth writing down.