At a festival, he saw performers beating taiko (Japanese big drum) with two bachi (drumsticks), suddenly he hit on an idea adapting the performers' style for a style of sword fighting, since then, he developed Nito-ryu.
祭りで太鼓が二本の撥を用いて叩かれてるのを見て、これを剣術に用いるという天啓を得、二刀流を発案した。