The action of this story takes place during a military conflict between the Duchy of Krakozhia and the Republic of Grania. The plot centers around a high‑school senior named Seoye Yano, who one fine day is suddenly confronted by two female soldiers in tanks from Krakozhia, informing him that he is a savior and that they will now protect him. Meanwhile, an enemy from Grania appears in the city, whose goal is to eliminate Seoye, even if it means shooting heavily into a residential complex.