Rena Hirose was an Usean fighter pilot that worked with the Universal Peace Enforcement Organization (UPEO). A sufferer of the rare Silverstone disease, she was first found by the corporation General Resource in her childhood because of her unnatural ability to fly aircraft. She was one of the central characters of the Usean Corporate War simulation formulated by Simon Cohen, interacting with the artificial intelligence Nemo as both friend and enemy at various points in the conflict.