 He requested formal instruction and began studying Takeda's style of jūjutsu in earnest, going so far as to construct a dojo at his home and inviting his new teacher to be a permanent house guest.He received a "kyōju dairi" certificate, a teaching license, for the system from Takeda in 1922, when Takeda visited him in Ayabe.Takeda also gave him a Yagyū Shinkage-ryū sword transmission scroll.