According to Donn F. Draeger, the founder of Wado-kai, Hironori Otsuka (born June 1, 1892 in the Shimodate village – died January 29, 1982 in Tokyo) began training Jujutsu with his uncle Chojiro Ebashi-sensei in 1898. As 13-year-old (1905), Otsuka began training Shindo-Yoshin-Ryu Jujutsu in Genbukan Dojo in the Shimotsuma village at Tatsusaburo Nakayama-sensei.
In 1910-1912, Otsuka studied at Waseda University.
The board of the Danish Wado-Kai is composed of 5 members, one member from each club in the Danish Wadokai.
The Danish Wado-Kai is affiliated to and recognized by the JKF-Wadokai.