A Hunter Warrior and cyborg healer named Ido formerly lived in the floating land of Zalem, the paradise that hovers above the refuse heap of Scrap Iron City in which he now resides with his former lover, Chiren. In his travels as a bounty hunter — killing spine thieves in a world in which human nerve tissue has become the most precious commodity — Ido one day discovers and repairs the remnants of a cyborg whom he names Gally. Though possessing the body of a young woman, Gally now embodies Ido's most sophisticated and lethal cybernetic skills. The preternaturally strong, amnesiac Gally begins to forge a life for herself in a world where every day is a struggle for survival. Based on the first two volumes of the manga.