Aya Mikage is a descendant of Ceres, a celestial maiden whose stolen robe prevented her from returning to the heavens. On her 16th birthday, Aya discovers that she has inherited Ceres's powerful blood and can transform into her. Her grandfather attempts to kill her, fearing she will destroy the Mikage family. With protector Yuuhi by her side, Aya must learn to control Ceres while uncovering the truth about her family and falling for one of her grandfather's former workers.