On her 16th birthday, Aya Mikage is in for twin surprises. Not only does she discover that she is a reincarnation of Ceres, a celestial nymph, but also that Aki, her twin brother, is the reincarnation of Mikagi, Ceres' ex-husband. This results in a noticeable change in Aya. To bring some sanity to the situation, Aya must find Ceres' celestial robe. And the search is going to be anything but easy.