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A prison named <>, trapped in a Altea, class 1 of the sixth grade of Sekka Elementary School. The yuma and the others try to build a system in which all the class members cooperate to escape this world, but the unexpected attacks by traitors turn their friends into stones one after another. "Why. Futaki!" Attacks without knowing their purpose. Betrayal by someone they trusted. Newly Discovered [DemonizeRatio] Demonization Ratio exists. And 愛莉亜's demonization follows his sister sour. In order to survive, young children deepen their symbiosis with or dependence on the devil without knowing the meaning and price.