In the year 5012, Earth was suddenly invaded from the sky by Aliens and their Machine Lifeforms, bringing humanity to the brink of annihilation. The surviving humans sought refuge on the moon and planned a counterattack with the help of android soldiers. However, the war reached a stalemate as the Machine Lifeforms continued to reproduce without limit. To turn the tide, humanity sent a new unit of android soldiers known as YoRHa, equipped with the latest technology. Among them was 2B, who joined forces with 9S, an analyst on the ground. As they carried out their mission, they encountered numerous unexplained phenomena. This is the story of the androids, who fight tirelessly for humanity's survival.