Ceres, a heavenly being, came down to Earth for a bath in a river, leaving behind her enchanted robe that granted her passage back to the celestial realm on a nearby tree. Regrettably, an unknown thief stole the robe, compelling Ceres to marry the culprit, resulting in a family with mixed blood. A descendant of Ceres, Aya Mikage, now possesses a significant amount of her ancestor's essence. During her 16th birthday celebration, Aya's grandfather attempts to kill her due to her exceptional powers that surpass those of any other family member. Aya has the ability to transform into Ceres and wreak havoc on the Mikage family. Nonetheless, Aya can switch seamlessly between her two forms. Alongside her protector Yuuhi, Aya must master her skills and keep Ceres under control. However, she is distracting herself with her fondness for a former employee of her evil grandfather.