Jikishin-Kai International
The primary affiliation of the Seishin-Kan is with the Jikishin-Kai International (JKI), which is the official international governing body for Shimabukuro-Ha Shitō-Ryū karate-dō. It is also one of several global governing organisations for Masaoka-Ha Musō Jikiden Eishin-Ryū iaijutsu and Shindō Musō-Ryū jōjutsu. The JKI is a reconstitution of the Jikishin-Kai International founded by Shimabukuro Masayuki Hanshi in 1993, and which was maintained after his untimely death by his widow, Shimabukuro Kanako Sensei, until her return to Japan in 2022.
The reconstituted JKI is managed by former students of Shimabukuro Hanshi, based upon the principles and practices of the original JKI. It has no sōke. Instead, it is governed by a Board of Directors elected from its membership, to ensure that its member dōjō and their students are the beneficiaries of all of its decisions and activities. This structure allows the JKI to keep its dues and fees at a minimum.