 He is Kouji's roommate, both aboard the Liebe Delta and the Ryvius, and the two are good friends.Ikumi is also the main operator for the Vital Guarder, coordinating the other four.Ikumi is the fourth and last in a successive line of captains aboard the Ryvius, following in the footsteps of such varied individuals such as Lucson Houjou, Aires Blue and - most recently - Juli Bahana.