Sakura is the granddaughter of a mysterious moon princess who slew demons with her Blood Cherry Blossom sword. All her life Sakura has been forbidden to look at the full moon without knowing why. Then one night, unhappy over her impending marriage, Sakura gazes up at the moon, only to see a demon attacking her...

Sakura is taken away by Enju to live in his hidden palace. Once there, Sakura comes face-to-face with a mononoke who looks and sounds exactly like her. Sakura has met her double, and her double wants her dead!