Shuji and Chise are two high-school students who have just started going out. One day, while visiting Sapporo, Shuji is caught in an air rate by an unknown foreign power. As Shuji runs through the city streets, avoiding falling bombs, a mysterious weapon appears and single-handedly wipes out the swarm of bombers. The weapon? His girlfriend, Chise... What do you do when your girlfriend becomes the ultimate weapon? This story is not about war, not about weapons, but more about a simple girl who has a huge conflict between what she is, what she is becoming and what she wants to be. In the middle of it all, her boyfriend Shuji.