Ceres was a tennyo, celestial maiden, who was trapped in the human world when her hagoromo, which holds the key to her return to the heavens, is stolen by a man who forces her to become his wife. Generations later the family has grown with a mix of human and tennyo blood. On Aya and her twin brother Aki's 16th birthday they are invited to a party for them where Aya's grandfather plans to kill her before her tennyo blood becomes to powerful and Ceres is reborn. Aya is able to escape thanks to her protector Yuuhi, but she will find that the powers of Ceres may be difficult to control and that her relationship with Yuuhi may prove to be a greater distraction.