With the countries of Arandas and Ingelmia embroiled in a seemingly endless war, the creation of a new weapon may be the key to this battle’s end. When reckless mecha pilot Susumu saves a civilian caught in the crossfire of a battle, he unexpectedly finds himself as the pilot of the prototype weapon known as Argevollen. However, whether or not this new machine will be able to turn the tides of war will be up to Susumu himself.
Turns out, Captain Samonji seems to be on a suicide mission while trying to fulfill Susumu's sister's wishes before she died. Having a dilemma on his hands, Susumu has to make some tough decisions or face the consequences.