Sergeant Kouji Tanita is a backup soldier of the Arandas Army's 8th Autonomous Unit. He is in charge of overseeing the backups.

			


Tokimune Susumu has every reason to distrust the military and question orders. His sister has already died in the service of the Arandas military, and his secret reason for enlisting is to ferret out the truth behind her mysterious death. So, when a civilian convoy is in jeopardy and his own battle mech is destroyed, Susumu's all too ready to break ranks and jump into the cockpit of the experimental Argevollen. What he isn't expecting, however, is that activating the Argevollen conforms it to his mind alone. Now he's on the frontline of the ongoing meat-grinder that the war between Arandas and Ingelmia has become, and his only certain ally is an attractive civilian contractor whose reasons for being in the war are as convoluted as his own.<br>
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(Source: Sentai Filmworks)

On September 22, 2024, I'M Enterprises announced that it had canceled its management contract as of September 14, 2024, due to an "acknowledged serious breach of contract." The agency added that Yamamoto is no longer working in the entertainment industry.