To save the shogun's honor and protect the country from great harm, 13 brave samurai embark on a seemingly impossible mission. Led by the honorable Shinzaemon, they intend to assassinate Lord Naritsugu, the shogun's half-brother, before he can take his seat on the council. For Naritsugu is a deranged sadist who tortures, maims, and kills for pure pleasure and dreams of finally ending the Japanese Empire's long period of peace with an entertaining war. But the brutal lord is always surrounded by a large bodyguard. Shinzaemon devises a clever ambush to at least reduce the enemy's superiority. Nevertheless, the 13 warriors know that while they may accomplish the mission, they are unlikely to survive...