On a near-future Earth where endless war is a grim reality, Kirio is the coolest kid at school. High above, a giant robot battles a fleet of gunships, but the brilliant and aloof Kirio remains unfazed—until the fighting mech unexpectedly lands in his front yard and rings the doorbell. Yet the greatest threat to Kirio might be what stands on the other side of the door: an alien invader robot with the face of an adorable girl!