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In a distant future where Japan is split into feudal regions under foreign rule, a floating city named Musashi, consisting of eight aerial ships, becomes the battleground for a crucial war led by students. Humanity, once ascended to a god-like state in the upper world of Tenjo, falls into conflict, shattering Tenjo and reverting to a war-torn Earth. Seeking refuge in Shinshuu, a portion of modern Japan, they replicate this haven in a parallel realm known as Juusou Sekai. Striving to restore their lost divine powers and the laws of causation, humans embark on a historical reenactment guided by the mysterious 'Testament'. However, a mishap during the Nanboku-cho War reenactment unleashes chaos as Juusou Sekai merges with the original world, prompting an invasion by the displaced inhabitants. Following defeat, Shinshuu's people endure partition and discrimination. As history reconstruction continues, a halt in the Testament's updates heralds an ominous silence, fueling fears of an impending apocalypse.

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