The utopian metropolis of Zalem hovers high in the sky, its presence dominating the horizon. Beneath it lies the noxious underbelly known as The Scrapyard, where the city stockpiles all of its waste. Humans and cyborgs live among the vast heaps of garbage, surviving by any means necessary. Daisuke Ido, a doctor specializing in cyborg repairs, finds the head of a young female cyborg while scavenging a pile of old android parts. He proceeds to build her a new body and names her Gally. Upon activation, Gally does not seem to remember anything about her past life. Nonetheless, she does not seem to mind, as long as she stays by Ido’s side. However, she soon discovers that Ido has a side job as a hunter-warrior, a bounty hunter working for The Scrapyard’s government. Despite Ido’s warning, she decides to become one herself, awakening her forgotten knowledge of fighting techniques. Equipped with newfound strength, Gally is determined to fight through the alleys of The Scrapyard and beyond, retrieving fragments from her past to rediscover her true identity.