Aizu Kage-ryū was transmitted to the founder by Murakami Ittō.
Ōishi Susumu improved the protective gear used during practice.
He was said to be five foot eleven inches tall (1.8 meters), a great height for a Japanese of his day.
There are stories of him engaging in combat around Japan using his four shaku shinai (about 121 cm).
Because the latter didn’t have a son, his younger brother, Ōishi Yukie was placed as the next headmaster of the ryū.
After the Meiji Restoration, they didn’t practice swordsmanship for some time, but the school survived still.
After Ōishi Hajime had grown up, he inherited his father's martial art.
These techniques were used by Ōishi Susumu for the first time in swordsmanship matches with the protective gear.