Lord Tokugawa Tsunatoyo, bound for Edo to be sworn in as the next shogun, is the target of merciless ninja assassins hired by corrupt officials hoping to put their own candidate in his place. His only hope is the “Oniwaban,” the shogunate’s secret ninja force, sworn to throw their lives down recklessly to prevent this coup. But will they stand a chance of getting the lord to his ceremony in time? A perilous chase, betrayal after betrayal, and a final bloodbath await them as ninja battle ninja in one last, desperate struggle.