Ayaka Aishi, also known by her codename "Ghost", is a top mercenary and older sister of both Toshi and Ayano...since she joined the G.D.A. (Global Defense Army), she's been rather cold to everyone. The only reason she is cold to everyone is because she doesnt want to look mentally weak in front of her little siblings. she deeply misses them both and wants nothing more than to see them again. But that would soon change when she has to find and kill Toshi, her little brother (she's 21 by the way).