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When the sky turns red, the moon turns black, and monsters roam the streets, Satsuki Kakeru finds himself involved in a dangerous situation and is transported into a different world. When he meets four others in the same predicament, they band together to survive and to navigate this mysterious new world. But things take a turn for the worse when six shadows appear with the intent of killing Kakeru and his friends. (Source: Sentai Filmworks)