Danzan-ryū
is a ryū of jujutsu founded by Seishiro Okazaki (1890–1951) in Hawaii. Danzan-ryū jujutsu is of mainly Japanese origin but is most common on the West Coast of the United States. The Danzan-ryū syllabus is syncretic and includes non-Japanese elements. History Seishiro Okazaki was born in Fukushima Prefecture, Japan in 1890. In 1906, he immigrated to the island of Hawaii. Soon after, he was afflicted with a pulmonary condition which may have been tuberculosis. During this time, young Okazaki began studying under a Yōshin-ryū jujutsu sensei by the name of Yoshimatsu Tanaka in Hilo, Hawaii. Okazaki assiduously pursued his studies under Tanaka and after some time found that his respiratory condition had gone into remission. Okazaki felt that the study of martial arts had played a large role in his physical recovery and as a result, he decided to dedicate his life to the study and teaching of jujitsu and related disciplines. Okazaki later adopted the Western first name, Henry. In 1924, Okazaki returned to Japan and undertook a study of the various schools, or ryū-ha, of the then most popular Jūjutsu styles of Yōshin-ryū, Namba-Shoshin Ryū, Iwaga Ryū, Kosogabe Ryū, Kōdōkan Jūdō, and several others. Later that year when