To counter the great powers surrounding the mighty empire, the "Sky Striker" was developed using advanced military technology. Its power was enough to instantly change the course of battle. The girl "Raye," entrusted with the "Sky Striker," repeatedly encounters the girl "Roze" from the hostile nation wielding equal power on the battlefield. Each time they clash with the "Sky Striker," Raye gradually gets a glimpse of the "human heart" within Roze and rises up to free her! To meet Roze not as a "weapon" but as a "person"---