Lonely Castle in the Mirror (Manga) Vol. 1

Kokoro is a junior high school student--but after years of bullying, she's become so anxious that she no longer goes to school. One day, she's pulled through her full-length mirror into a castle in another dimension by a girl in a wolf mask. The mysterious girl tells Kokoro and six other kids that they will compete in a scavenger hunt. If one of them finds a key that unlocks a secret room, that person will get one wish granted. As long as they observe the rules of the world, they can come a...