Someone steals Kaori's heart after her death. Ryo meets an assassin named Glass Heart with a scar on her chest after a year of searching for Kaori's heart.

Xiang Ying, also known as Glass Heart, is rescued from the secret organization by Ryo. With Ryo's support, Xiang Ying tries to live her life as an ordinary girl, but she can't resist her ability to fight despite all her efforts.

Falcon meets a girl, Miki, who is widely known as 'a girl who brings happiness' in the city. Noticing Falcon's change in behavior, Ryo begins to investigate Miki.

Ryo's first client after his return to work is Takahata. Takahata asks Ryo to find a family of his heart donor.

Bai Lan, who used to belong to the organization Legion with Xin Hong, stays with Hayakawa, the Junyo Group's leader, for now, but the Junyo Group is a rival of Legion. Is Bai Lan waiting for the perfect time to kill Hayakawa?

Saeko offers Ryo a job who receives a challenge from Toyama, the criminal who killed her boyfriend Makimura ten years ago. Ryo can't help but accept Toyama's challenge because Makimura is Kaori's brother.

A girl, Yume, wants to know who killed her father and who he really was. Xiang Ying knows the truth because she is the one who killed him.

Legion is finally on the move. Xiang Ying is kidnapped by them. Ryo and others are ready to rescue her, but knowing Legion is a vicious criminal group, Saeko disagrees with them.

Ryo faces a last-ditch battle with Legion and finally meets Li, the Legion's leader who reveals a startling secret about Xiang Ying's birth.