One thousand Japanese high school students are suddenly thrust into an unfamiliar world rife with dangerous monsters. Their survival becomes dependent on those who awaken to unexplainable powers. Majima Takahiro, a normal second-year student, does not get any such power. Instead, he joins the majority of students building the homestead. But when a group of empowered students revolt, Takahiro is left wandering the forest on the verge of death. Having lost all faith in humanity, he finds salvation from an unlikely source: monsters!

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Majima Takahiro and his friends survive the ordeal inside the labyrinth and learn the truth about the world. Their very existence threatens to trigger another Grand Calamity, a world-ending event. Fortunately, they also possess the knowledge to preempt such a catastrophe. Set to return to Aker to accomplish that goal, they are forced to go back to the capital when they are informed that the world faces more than one apocalyptic threat.