Despair War is a battle between ancient guns and contemporary guns. The world was destroyed by a nuclear war. Under the total control of a world empire, people live with their freedom stripped away. Despite the ban on owning any weapons, a resistance secretly fights against the world empire. They own ancient guns preserved as art and fight using them. Then, the Kijuushi appear as the souls of the ancient guns. Proud and magnificent, the "Absolute Royal" are the only ones that can give hope to this world. The story depicts the everyday life of the Kijuushi. Laughter, despair, happiness, confusion, pain; they would still pursue their own absolute loyalty to fight. What do they fight for? What should they protect?