Desperate to put an end to a brutal war, pilot Kei Katsuragi launches a last attempt to destroy the weapon at the heart of the conflict: the dreaded Space/Time Oscillation Bomb. But Kei’s actions have unforeseen consequences and plunge his world into a maelstrom of intersecting alternate realities and timelines. Now he must try to reverse the effects of the detonated Space/Time Oscillation Bomb, but restoring the world to normal may be beyond his reach…

[Source: HIDIVE]

Years of political tension and mistrust between the two rival nations of Zafran and Revillia escalate to the point of war. Each nations solution: to gain possession of Decimators, the same ancient robots of war that nearly ended all life on the planet 200 years before. As the war ensues and the leaders of both nations become reluctant to surrender, only the desperate plan of Lean, a young cadet, and Nataruma, a psychically gifted young woman, to alter the timeline of events 200 years before stands the chance between humanity's survival or absolute destruction.

[Source: Anime News Network]