Ryūgō-ryū (柳剛流) was founded by Okada Sōemon Kiryō (岡田惣右衛門奇良, 1765–1826), who was born at Sōshinden in Katsushika district, Musashi province (present-day Satte, Saitama). He first trained in Shingyōtō-ryū under Ōkawara Uzen (大河原右膳) — so that this school is itself an offshoot of the same Shingyōtō tradition that supplied three of the Kōbusho instructors — and after further study of Sanwa Muteki-ryū, Tōgun Shintō-ryū and other lines, devised his own method. The name is traditionally explained by the image of a streamside yanagi (柳; ryū / yanagi) lashed by the wind yet never broken, captured in the saying yanagi ni yukiore nashi (柳に雪折れなし; “no snow-break on the willow”). Ryūgō-ryū was a composite art transmitting kenjutsu, iai, jōjutsu (杖術; short-staff) and naginatajutsu (薙刀術; glaive), and its signature was the sune-giri (脛斬り; shin-cut) — apparently borrowed from the glaive’s low sweeps — together with cutting on the tobichigai (飛び違い; the crossing pass). The result was a markedly practical method of disabling opponents at the legs while advancing; by the Man’en 1 (1860) martial register it reportedly counted more students than the Hokushin Ittō-ryū. Curriculum levels were simple — kirigami (切紙; entry-level transmission certificate), mokuroku (目録; catalog scroll of transmission) and menkyo (免許; full transmission license) — and a licensee was free to found a branch, so the school proliferated into many local lines.
Fragments of Ryūgō-ryū survive in regional traditions (for example in lines of the former Sendai domain and of Tamaru in Mie); English-language material is sparse.
