An underdog teen joins a group of young Cadets who've been chosen to bond with Robo Mechs from space and defend Earth against alien invaders.
The distant future, 5012. The sudden aerial invasion of Earth by ＜Aliens＞ and their creations ＜Machine Lifeforms＞ led mankind to the brink of extinction. The surviving number of humans who took refuge on the moon to organize a counterattack using ＜android＞ soldiers to recapture Earth. However, the war reaches a stalemate as the ＜Machine Lifeforms＞ continue to multiply infinitely. In turn, humanity deploys anew unit of android soldiers as an ultimate weapon: ＜YoRHa＞ Newly dispatched to Earth ＜2B＞ joins ＜9S＞, the analyst currently stationed there, where amid their mission, they encounter a myriad of mysterious phenomena... This is the story of these lifeless ＜androids＞ and their endless fight for the sake of mankind.