Tập 1: Một cựu sát thủ nhận được trái tim bị đánh cắp từ người bạn đồng hành đã khuất của một người dọn dẹp.

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"Glass Heart", a 15-year-old girl and assassin trained by a Taiwan mafia, Zheng Dao Hui, attempted suicide after she completed her 50th mission. Meanwhile, Kaori Makimura, beloved partner of City Hunter, Ryo Saeba "the Sweeper", died in a traffic accident. As Kaori was an organ donor, her heart was removed for transplanting, but it was stolen while being transported. Glass Heart's life was saved by receiving Kaori's heart, however a year went by without her recovering consciousness. Ryo has ceased working as City Hunter and he has led a degenerate life ever since. However, he believes that Kaori's transplanted heart still lives on in someone else (Source: Wikipedia)