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.

In a desperate bid to avert disaster, Ultimo's master Yamato tries to convince his high school crush to join him on the side of good Meanwhile, Ultimo is challenged to a duel by Vice, and the battle between good and evil resumes in earnest. Will the Karakuri D ji finally break free of their dastardly puppet master's grand plan?