The distant future, 5012.

The sudden aerial invasion of Earth by <Aliens> and their creations <Machine Lifeforms> led mankind to the brink of extinction. The surviving number of humans who took refuge on the moon to organize a counterattack using <android> soldiers to recapture Earth.

However, the war reaches a stalemate as the <Machine Lifeforms> continue to multiply infinitely. In turn, humanity deploys a new unit of android soldiers as an ultimate weapon: YoRHa. Newly dispatched to Earth 2B joins 9S, the analyst currently stationed there, where amid their mission, they encounter a myriad of mysterious phenomena…

This is the story of these lifeless <androids> and their endless fight for the sake of mankind.

[Source: official English website]