Nier automata

Intro in this world humans are no longer part of the earth, the aliens took the earth and used robotic bodies, but humans created androids created to fight the invader, call YoRha unit, they are grouped into 3 groups, b=combat, s=scout, m=machine gun (gender and type thing) story: one day a virus hacked all the androids, only you, 9s and 2b were survivors