Ichiro 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 Ōgami was sent to work with the Hanagumi, as Kayama worked with the Tsukigumi. Originally an ensign, he was later promoted to lieutenant junior grade. Oogami was later given the Shintou-Mekkyaku, one of the four spiritual swords, by an injured Yoneda after he awoke from a coma. Later, he and Sakura came to possess the Shinken-Shirahadori and Koutou-Mukei spiritual swords to carry out the Ni-ken Ni-tou no Gi.