Angel Heart (エンジェル・ハート) is a Japanese manga series written and illustrated by Tsukasa Hojo published in the Comic Bunch from 2001 throughout 2010. After Comic Bunch stopped being a print magazine and became an online magazine, the manga was transferred to Monthly Comic Zenon under the title of Angel Heart: 2nd Season, which ran from 2010 to 2017. An animated television series based on the manga aired in Japan from October 3, 2005, to September 25, 2006, while a live action TV drama was released in 2015.
The author mentioned in the first tankōbon volume that Angel Heart shares the same characters as City Hunter but is not its continuation.
Plot
A young woman stands on top of a building in Shinjuku as she receives a call from her handler. The handler, who calls her "Glass Heart", congratulates her with a job well done regarding her latest kill, which he refers to as her 50th. Glass Heart recounts the day's events. She had just killed a man sitting on a park bench with a silenced gun. As she was leaving the park, a small girl runs in with some ice cream and Glass Heart realizes that she has just killed the father of a little girl. With that she jumps off the building, impaling her chest on the iron spiked fence below.
At the same time, Kaori Makimura is running late for an appointment to take wedding photos with her husband, the "City Hunter" Ryo Saeba. When she sees a girl about to be run over by a truck, she jumps and pushes the girl out of the way before the truck hits her. A short while later, she is declared brain dead and her heart is harvested for organ donation, as she had a donor card on her when she died.