Dan Fei has devoted her life to guarding the Sword of Divine Retribution, a legendary weapon powerful enough to threaten both humans and demons. When the Xuan Gui Zong sect moves to seize it, she is forced to flee rather than let the blade fall into the hands of its ambitious master. Pursued across the kingdom, Dan Fei accepts the aid of two formidable strangers whose motives and skills draw them into the conflict surrounding the sacred sword.