Marie, who has been injured by an attack of a demonic beast, heads to Erendel Castle, where the lord resides, to request a healer. Erendel Castle does not allow anyone to visit - after all of the seven brides who married the lord died mysteriously. After many twists and turns, Marie enters Erendel, where she comes face to face with the protagonist of the rumor, Duke Gabriel Lucia... "If I grant your request, you must also give me something." "Okay. What do you want from me?" "You're going to be my eighth bride."