A sadistic Daimyo (Feudal Lord)s a woman and murders both her and her husband, but instead of being punished, his political connections will ensure he will become a Shogunate Elder.
To save the Shogunate, a plot is hatched to assassinate him. The two most brilliant strategic minds in Japan find themselves pitted against each other; one is tasked to defend a man he despises, and commands a small army. The other is given a suicide mission, and leads 12 brave men.
They are the 13 Assassins.