NieR Automata (Human x 2B)

(DISCLAMER: This is NOT a Reader x 2B story)

In the year 5012. Aliens from outer space launched an invasion of Earth. Due to their military creations, called "Machines," humankind was annihilated. The few survivors sought refuge on the moon.
The year 5204. Counteroffensive measures using androids were initiated from the twelve bases constructed in satellite orbit. Within the same year, they made many sorties to Earth and delivered large-scale attacks. However, due to the sheer number of Machines, they failed to land a decisive blow.
Then, for several thousand years, the battle was deadlocked. To take the upper hand, research and development for a definitive anti-Machines measure, the YoRHa android, was launched. After performing many experiments with prototypes, the first YoRHa android was created in the year 11937. Roughtly a hundred years had passed since the founding of the project and still, the collective number of 'people' believed that not a single human had set foot on Earth for thousands of years, although, even androids can make mistakes.