The manga centers on homicide detective Hiroki Dan, the son of a former police superintendent general, and who seems to be on the fast track to career success. He maintains a hidden identity as a serial killer responsible for more than a hundred murders of people he deems beyond the reach of the law. 
 
(Source: Anime News Network)

A crime suspense story set in a forensic laboratory where specialists work to uncover clues from seemingly insignificant bits of trace evidence. The story begins when Sawaguchi Nonna, a rookie forensic researcher, meets Mano Reiji, the man who solved her parents' murder case.

Hiroki Dan, the Chief of the Tokyo Metropolitan Police Department's 1st Investigation Division, is an elite among elites with a brilliant career. But his hidden side is that of a serial killer who dispenses vigilante justice upon sinful villains. 
This is the second official spin-off of "Trace: Reminiscences of a Forensic Scientist." The devil's enviable record of vengeance, preying upon the wicked, begins again. (Source: Comic Zenon, translated)

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