Nakajama sensei se učil odnož Šimomura ha školy Hasegawa Ejšin rjú a také později Tanimura ha. Jeho osobní pojetí těchto škol, jež vzniklo ze studia obou větví, tak bývá po roce 1930 nazýváno Musó Šinden battó džucu a později se uchytilo…
Kotaro Naruse resigned from a real estate agency, that he worked in after leaving university. He then took over the "Sky Blue" cafe in the town of Sodegaura, Chiba Prefecture, run by a relative who died in an accident and lost his parents.