Kokoro hides in her bedroom after she loses her place in school. One day, the mirror in her room begins to shine, and pulls Kokoro into a fairytale castle. Six other students have been brought to the castle too. A strange girl in a wolf mask tells them that they will grant a wish if they find the key hidden in the castle within a year.As Kokoro and her new acquaintances spend more time in their new sanctuary, they begin to unlock the castle’s secrets and each other’s. Can they get the hidden key? Why are they chosen? And what are their secret wishes?