Kennin Gido (Kei Tanaka) is a detective. He belongs to a mysterious division at the Tokyo Metropolitan Police Department. He is the only member in the division. There, Kennin Gido re-investigates cases that received not guilty verdicts. He searches through testimony and evidence from those cases to catch the real criminals. Kennin Gido is called "Shinigami" ("Grim Reaper") by those around him.—AsianWiki

Gido Kennin is an assistant police officer from the Metropolitan Police Department, who is nicknamed the "Grim Reaper" as he works hard to re-investigate false acquittal cases and ensure that the truth of the cases are revealed. Together with Gido is his partner police officer, Minamikawa Mei (Season 1) / Kotone Aoi (Season 2), who helps him to overturn all the testimonies and evidences to find the truth hidden behind every incident.—DramaWiki