An angel descends to Earth to bathe, hanging her celestial robe of feathers on an ancient pine. A man steals the robe, imprisoning the angel, and, in some versions of the tale forces her to marry him. Sixteen-year-old Aya Mikage discovers she and her twin brother Aki are the direct descendants of the angel and the psychic powers they've inherited make them the targets of a vast, murderous conspiracy. Aya quickly finds herself in a classic dilemma with two boys on hand to protect her, the silent, mysterious Toya and cheerful, slightly klutzy Yuhi.