Due to an incident in her childhood, Hinako is living a secluded life in a harbour town and often struggles with her will to live. The ocean she sees every day has been both threatening and eerily fascinating for her ever since until Shiori emerges from its depths to protect and eventually eat her.
Upon enrolling in the local middle school, Kokoro loses the courage to actually attend. While isolating herself in her room, her bedroom mirror begins to glow, allowing her access to the mirror castle, where she meets six other children who are supposed to be in school and a younger girl in a wolf mask.
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