Ultimo and Vice are Karakuri Doji, the mechanical embodiment of pure good and pure evil, devoid of human emotions that can cloud one's judgment. Their purpose: to battle to the death to prove once and for all whether good or evil is the most powerful force in the universe. Kurenai Doji: with girl and money troubles, life is hard enough for high school student Yamato, but then he stumbles upon Ultimo, a peculiar-looking puppet. Things only get stranger when Ultimo awakens and his archenemy Vice shows up. Will this be the battle that finally decides good versus evil, or is this just the beginning of a most fantastic adventure?