Captain Kei Nagase is an Osean astronaut and former fighter pilot. During the Circum-Pacific War, she was second-in-command of the Osean Air Defense Force's Wardog Squadron (later Razgriz Squadron). Nagase was still in training at the time of the war's outbreak, but her piloting skills dramatically improved over the course of the war. She initially served under Captain Jack Bartlett until he was shot down during Operation Gyre on September 27, 2010. From that point forward, she served under WD1.