5012 is a far-off date. Mankind was on the verge of destruction when aliens and their inventions, "Machine Lifeforms," suddenly attacked Earth from space. The amount of people still alive who fled to the moon to plan a counterattack using "android" warriors to retake Earth. However, because the "Machine Lifeforms" keep growing endlessly, the conflict comes to a standstill. As a response, mankind sends forth a fresh squad of android warriors to serve as its ultimate weapon: YoRHa. Recently sent to Earth, 2B> joins 9S>, the analyst already stationed there. While on duty, they come across a variety of strange occurrences.