Lonely Castle in the Mirror — Episode 1

Kokoro is a junior high school student who doesn’t fit in at school and has secluded herself in her room. One day, the mirror in her room begins to suddenly shine and she is sucked inside. There, she finds a fairy tale castle and six unknown junior high students. Then a girl wearing a wolf mask appears and tells the seven of them that they have been chosen to have any one wish they want granted. Why were they chosen?