Isshin-Ryū is a style of Okinawan karate created by Tatsuo Shimabuku in approximately 1947/1948. Isshin-Ryū karate is largely a synthesis of Shorin-ryū karate, Gojū-ryū karate, and kobudō. The name means, literally, "one heart method". In 1989 there were 336 branches of Isshin-ryū throughout the world, most of which were concentrated in the United States.

Okinawa Prefecture is the southernmost and westernmost prefecture of Japan. It has a population of 1,457,162 and a geographic area of 2,281 km2.