Two detectives from different eras, warm-hearted Hidaka and cool Fuwa, team up in the "Okra" department to solve long-unsolved cold cases, utilizing their generational gap to unravel the truth behind each mystery using the slightest clues.

A first-hand account of the Tokyo Metropolitan Police beat following Jake Adelstein, an American journalist who embeds himself into the Tokyo Vice police squad to reveal corruption. Based on Jake Adelstein’s non-fiction book of the same name.