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