The Snitch's Serenade: Tokyo Metropolitan Police Case File S01 E01 Secret Notice Hautau Police Agency Inspection File

"Tailing, stakeouts, betrayal— A hard-boiled thriller full of suspense and mystery!"

Starring Masahiro Matsuoka. "Police in the police" = Inspector General, Personnel Division 1, Metropolitan Police Department. Who is the real traitor? A tense hard-boiled suspense where the pride and will of the police officers and the tactics of conspiracy are mixed violently.