Set in a distant future where humanity has retreated to the Moon following an invasion of Earth by alien-created machines. To reclaim their home, humans deploy combat androids, known as YoRHa, to battle the machine lifeforms on Earth. The narrative centers on three primary androids: 2B, a combat unit; 9S, a scanner unit; and A2, a rogue prototype. As they engage in the ongoing conflict, these androids begin to question their purpose and the nature of their existence. Throughout their journey, they uncover profound truths about the war, the machines, and the fate of humanity, leading them to confront complex moral dilemmas and the essence of their own identities.