The most formidable assassin in history appeared in Shinjuku—an exceptionally beautiful human weapon. Her name was Xiang Ying, and her codename was “Glass Heart.” While her flawless work earned her high praise from the organization, her heart grew weary and damaged with each mission she carried out. Tormented by her conscience, she eventually chose to end her own life—but the organization brought her back to the living world, transplanting into her the heart of Kaori Makimura, the dearly beloved partner of the late Ryo Saeba.
With Kaori’s heart inside her, “Glass Heart” began to feel emotions for the first time. She withdrew from assassination and developed the will to oppose the organization. Unconsciously drawn to Ryo Saeba because of Kaori’s heart, she stepped into the world of the “City Hunter” as a sweeper.