Shy and withdrawn, Kokoro has been skipping school for weeks when she stumbles upon a portal hidden in her bedroom mirror. Stepping through, she finds herself in a magical castle alongside six other students. A girl in a wolf mask reveals they’ve been summoned to participate in a game, challenging them to unravel the secrets linking their lives. Tensions rise as they navigate the rules, with a chilling warning: those who fail to comply with the game’s demands risk being devoured by a lurking wolf.