That legendary superweapon from history? That’s me

500 years ago, the world was engulfed in the Magical Great War. Amid the conflict, a special soldier—who had a combat AI called DEMON implanted in his head and a superweapon capable of destroying even mountains embedded within his body—dominated the battlefield. “Cross, stop looking down and pay attention! Are you even listening?!” Even if you tell me that, how am I supposed to look up…? Because the soldier shown in that historical footage from 500 years ago, fighting with the ferocity of a demon god… is none other than me!!