The protagonist is Kokoro, a middle school student who has no foothold at school and keeps himself at home. One day, the mirror in the room suddenly glows. Kokoro passes through the mirror as if he was inhaled, and finds that there is an incredible building like a castle in front of him, where seven people who have similar experiences with Kokoro are gathered. There is a secret key hidden in the castle, and any wish can come true to the man who finds it.
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