Robou, a corporate drone with an extraordinary passion for giant humanoid robots, is hurt when a colleague bluntly states, "Giant robots aren’t necessary." That very night, he is summoned to another world with an unusual request: "We need you to fight using a giant robot." Though uncertain, he chooses to reincarnate into this new world. Thus begins his second life as the spirit of Volcamion—a mighty humanoid mecha revered by the Volcami Empire. Robou, now dwelling within the massive war machine Volcamion, starts a new life... as a god.