Episode 7: 3.53 Million Witnesses!? The "Labyrinth" Shinjuku Station Great Search, Police Officer Poisoning Trick

Kioku Sousa ~Shinjuku Higashi-sho Jiken Fairu~ – Season 1

An old pocket watch is found bearing Onizuka's blood and fingerprints, identifying its owner as a missing victim from the infamous Waseda random stabbing incident. Simultaneously, the body of Gen Aoki, the former Judicial Affairs head who abruptly resigned, is discovered at Shinjuku Station. As the team learns Aoki had been secretly visiting the missing victim, Onizuka must unravel a labyrinth of connections between his past case and this new murder.