The August issue of Tokuma Shoten's Monthly Comic Zenon magazine revealed on June 26 that Kei Koga's Trace: Kasōken Hōi Kenkyūin no Tsuisō (Trace: Recollections of a Forensic Researcher) manga has a new spinoff manga titled Brutal: Satsujin Kansatsukan no Kokuhaku (Confessions of a Homicide Investigator). Ryō Izawa is drawing the new manga, which debuted in Tokuma Shoten's Comic Tatan website last Friday.
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.
The original Trace: Kasōken Hōi Kenkyūin no Tsuisō manga is a crime suspense story set in a forensic laboratory where researchers work to uncover clues from small details. The manga's story begins when Nonna Sawaguchi, a rookie forensic researcher, meets Reiji Mano, the man who solved the case behind the double murder of Nonna's parents.
Koga, who has previously worked in a forensic laboratory, launched the manga in Tokuma Shoten's Monthly Comic Zenon magazine in January 2016. Tokuma Shoten published the manga's seventh volume on June 20.
Koga revealed last month that the manga is "approaching its climax."
A live-action television series adaptation of the manga premiered on January 7.
Sources: Monthly Comic Zenon August issue, Comic Tatan