When the "Sirens," an alien force with an arsenal far surpassing the limits of current technology, suddenly appeared, a divided humanity sto...

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Following the closure of Uranohoshi Girls' High School, the third-year students—Dia Kurosawa, Kanan Matsuura, and Mari Ohara—have just g...

The signing of a peace treaty has secured a tenuous ceasefire between mankind and the Zex, beings who emerged from space/time rifts connecte...