The Security Guard Center sets the stage for this drama that stars Mamoru Shinomiya, a newly-hired emergency responder. Together with his brilliant colleagues, all of whom have colorful personalities, they tackle one emergency after another with flying colors and restore the safety and security of their clients and the public.

Ryo Saeba is a private detective and a sweeper who rids society of evil. He is also known as City Hunter. He works with partner Kaori Makimura. An accident leads to Kaori Makimura's death and her heart is transplanted to Xiang-Ying. Xiang-Ying then appears in front of Ryo Saeba.

A mysterious code written with letters and numbers is found on a street in Kyoto. Yoshito Takuma (Tsuyoshi Kusanagi) and Chinami Anekoji (Kaho Minami) begin to investigate. They discover that something happened at the place where the code was found on stickers and they also discover a dead body. A man known as "Writer" is suspected of being the culprit. To find the man known as "Writer," Yoshito Takuma infiltrates into Shiga central prison. --asianwiki

Satoshi Itomura is an assistant police investigator who belongs to the Metropolitan Police Department’s Scientific Investigation Team. Reenactments, fingerprint and voice data collections, profiling... His team collects scientific evidence and pieces together fragments of information in order to help build evidences. However, Itomura often does not care about the scientific approach and instead pays a great deal of attention to the things that the victims always carried with them or treasured. And he focuses on these things because they usually carry the victim’s dying wishes, understanding that last message not only helps solve the cases but also brings closure to the depressed family of victims.