In ancient feudal Japan, Ultimo and Vice were forged to embody 'perfect good' and 'perfect evil' as the final legacy of Dr. Dunstan's malevolent design. Fast forward a millennium to the chaos unfolding in Farmless City, West Tokyo, where a masked monster unleashes terror beyond the reach of the S.K.A.T. Police force. Ultimo boldly confronts the creature, revealing its sinister truth as Vice, his malevolent twin. The ensuing battle leaves both mechanical beings battered, setting the stage for a series of strategic maneuvers among various factions across Japan.