Protagonist of the Sakura Wars games 1 through 4. Ensign of the Imperial Naval Force, later promoted to Lieutenant Junior Grade. He was chosen to head the Hanagumi when he proved himself capable during a test of a Koubu prototype at sea. Kayama was with him during that time, but eventually Oogami was sent to work with the Hanagumi, as Kayama worked with the Tsukigumi.