In 12th century Japan, Yoshi, a down-at-the-heels bushi, agrees to do a "small favor" for Surei, his estranged lover. This embroils Yoshi and Surei into a deadly conspiracy for control of the Chrysanthemum Throne. Can Surei and Yoshi put aside their differences and come together to survive traitorous retired emperors, powerful yin-yang sorcerers, deadly shape changers, and vengeful spirits?