Established in the future, the story focuses on Alita, a female amnesiac cyborg, saved by a scientist and transformed into a lethal being trying to remember her own past. The story takes place 300 years after a social collapse caused by a major war. This society is a dark age of technology, a post-apocalyptic world where cyborg technology is a way of life. Alita has an organic human brain, an artificial body, and she looks like a teenager for almost fourteen years. Found by mysterious Doctor Ido while searching for cyborg pieces, Alita is reconstituted by cyber surgeon who becomes her surrogate father. Reconstructed, Alita, only remembers her training in a deadly martial art, becoming a warrior hunter, pursuing and eliminating savage criminals. To achieve its true purpose, she must struggle, embarking on a journey of self-discovery and discovery of love.