What is "omori-ryu"

is a iaijutsu koryū founded by Ōmori Rokurōzaemon Masamitsu (大森 六郎左衛門 正光), probably in the latter half of the seventeenth century. The techniques developed by Masamitsu were later incorporated into Hasegawa Eishin-ryū and continue to be taught to this day as the first series of kata in Musō Jikiden Eishin-ryū and Musō Shinden-ryū.