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...

Princess Sakura has been staying at the estate of Fujimurasaki, the future emperor. Fujimurasaki tells Sakura he loves her and keeps her hidden from Aoba. Sakura yearns to be reunited with Aoba, but he's to marry Princess Yuri...