Kamui Gaiden (カムイ外伝) is a 2009 Japanese film directed by Yōichi Sai, based on Sanpei Shirato's manga series of the same title. The film is written by Sai and Kankurō Kudō, starring Kenichi Matsuyama in the title role. It premiered at Toronto International Film Festival on September 16, 2009, to mixed reviews. The English version was released as Kamui and the film was retitled Kamui: The Lone Ninja on the home video.