Inspectors Arata Shindou and Mikhail Kei Ignatov stumble upon a perilous scheme targeting the Sybil System, Japan's esteemed evaluator of human nature. A clandestine organization plots against this system, amassing influence and riches covertly. When Bifrost operative Kouichi Azusawa escalates matters by seizing the Criminal Investigation Department (CID) headquarters and holding Inspector Shindou and others hostage, it falls upon CID Unit 01's supervisor, Chief Mika Shimotsuki, and former team members Shinya Kougami and Nobuchika Ginoza to rescue the captives and reclaim control. Amidst Azusawa's demands and the hostage crisis, a sinister agenda unfolds, pushing Inspector Shindou to confront his past alongside the immediate threats. As the situation intensifies, Shindou edges closer to unraveling the enigma that has long haunted him and Ignatov, his steadfast comrade.