The conflict between the Kingdom of Arandas and the Countries Unification of Ingelmia has been ongoing for a long time. Despite the Great Wall remaining closed, when it finally opens, the nature of the war shifts significantly. A new recruit named Susumu Tokimune is about to join his first battle without considering the possibility of being trapped. During this encounter with engineer Jamie Hazaford and the Silver Trailkrieger, Argevollen, in a region where fighting has become commonplace, a small coincidence will alter not only the fate of Tokimunes Independent 8th platoon but also the trajectory of the war.