Sometimes it's much harder to uncover the truth than it is to cover it up as Saori reveals the mysterious death of Susumu's sister. Now, Susumu must come to grips while going off to fight in another battle, hoping to restore faith in humanity.
Jamie must give Susumu an aptitude test to see if he will continue to pilot Argevollen. Afterwards, the gang all goes out to celebrate a promotion of one of their own, where the Captain reveals a shocking truth to Susumu.
The sunflower field where his sister disappeared years before now becomes the battlefield as Susumu is just starting to get the hang of Argevollen to stop a surprise attack - and a rematch - from the enemy.
Argevollen has shut down and Jamie must risk her life and limb to save Susumu and the machine. She fears handling such a huge responsibility as she crosses enemy lines and enemy fire to reboot Argevollen.
Two warring countries have long battled because one is hoarding all the wealth. A young pilot, Susumu Tokimune, trades in his slow Trail Krieger for Argevollen, a masterful new model mecha machine, to save a young girl named Jamie Hazaford.