黒龍会
In 1908 he and Deguchi Nao founded the Dai Nihon Shūseikai which in 1913 became Taihonkyō and in 1916 the Kōdō Ōmoto. In 1923, he learned Esperanto, an international planned language, and introduced it to the activities of Oomoto. In 1924, retired naval captain Yutaro Yano and his associates within the Black Dragon Society invited Onisaburo on a journey to Mongolia. Onisaburo led a group of Oomoto disciples, including Aikido founder Morihei Ueshiba. Ikki Kita had previously been sent to China by the Black Dragon Society and had in 1919 proposed that Esperanto be the only language spoken in the Empire of Japan.