The Independent 8th platoon is stationed at the secret stronghold in the Arandas East mountain range. It is where a new recruit, Susumu Tokimune, is waiting for his first battle. The platoon is ordered to redeploy to join the main unit under the command of Lieutenant Samonji Ukyo. Along the way, they encounter the Ingermere army who are assaulting civilians.
Tokimune takes the lead without thinking of the possibility of being trapped, and has a fateful encounter with engineer Jamie Hazaford and the Silver Trailkrieger, Argevollen.
The encounter takes place in a corner of the world where fighting has become the norm. This small coincidence is going to change the future of Tokimune's Independent 8th platoon as well as the course of the war.