Alita returns to Mars for the first time in centuries after the events of Last Order, while flashback chapters dig into her forgotten childhood there as a young cyborg named Yoko, fighting to survive amid Mars's old wars. Set across two timelines three hundred years apart, this manga fills in the history Alita herself does not remember, tracing how a war orphan on Mars became the fighter Dr. Ido later found on Earth. It is the third major installment in the Battle Angel Alita series.