A Taiwanese assassin called "Glass Heart" made a suicide attempt by jumping off a building but was saved by a heart transplant. As she recovered, she began having vivid dreams that compelled her to go to Japan to find the person who donated her heart. She was shocked to discover that the donor was Kaori Makimura, a previous associate of Ryo Saeba, the City Hunter. Nonetheless, in the first volume of Angel Heart, the author clarified that while the characters have resemblances to City Hunter, the story takes place in a distinct universe and does not follow from its predecessor.