Kamiya Koshijiro was the founder of the Kamiya dojo, the creator of Kamiya Kasshin-ryū and the father of the dojo's current master, Kamiya Kaoru. After fighting in the bakumatsu on the side of the Ishin Shishi patriots, Koshijiro returned to his hometown of Tokyo and developed a kenjutsu style that would protect people rather than take their lives. However, he was drafted into the Seinan Wars and, in 1877, died on the battlefield. His name is not given in the Rurouni Kenshin series, but an identical character with an identical background is mentioned in the Volume 3 End-of-Volume extra chapter.