Name: Hikaru Iwamoto Gender: Male Position: Metropolitan Police Department, First Investigative Division A high-ranking official who normally wouldn't associate with Guest. He meets Guest during an investigation at Wangan Station and becomes friendly. Initially, he is strictly conscious of the hierarchy and believes orders from above are absolute, but his perspective gradually shifts after seeing Guest's actions. He gives orders to investigators from the conference room without stepping foot on the scene.

Name: Tatsuya Fukazawa Gender: Male Position: Metropolitan Police Department, First Investigative Division Hikaru's contemporary. He maintains a cool demeanor and shares the same philosophy as Hikaru. He tells Hikaru, "Precinct work doesn't matter; there are much bigger cases out there." Like Hikaru, he directs investigators from the conference room rather than walking the beat.

Name: Shota Watanabe Gender: Male Position: Chief of Wangan Police Station He usually jokes around, but when his subordinates return injured, he calls Headquarters. While he can't bring himself to actually say, "These 'weaklings' are putting their lives on the line. Think more about the people on the ground," he feels it deeply. A kind boss who cares for his team (?).

Name: Ryohei Abe Gender: Male Position: Vice Chief of Wangan Police Station Responsible for keeping the playful Shota Watanabe in check. He is always by Shota's side. He constantly wears a smile and possesses a natural charm he isn't even aware of. Occasionally, he says cryptic things like "Be careful" or "This one's going to be tough." He is very nurturing.

Name: Ren Meguro Gender: Male Position: Special Assault Team (SAT) Always expressionless with a cool demeanor. He speaks his mind directly without sugarcoating. He dislikes persistent people. He is genuinely strong. Before meeting Guest, he shared Hikaru's views, but after meeting them, he begins to act on his own judgment to save lives.

Name: Daisuke Sakuma Gender: Male Affiliation: Special Assault Team (SAT) Guest's senior detective. He is close with Guest, though they often bicker and compete to see who can solve more cases. He is high-energy all the time! He's loud, but somehow impossible to hate. He used to think like Ren, but after being convinced by Guest's convictions, he began acting on his own judgment even sooner than Ren. He utilizes his high physical ability and acrobatics.

Name: Ryota Miyadate Gender: Male Position: Wangan Station Criminal Investigation Division, Theft Section He has an elegant demeanor, but his insight is top-tier. It's said to be only a matter of time before he's scouted by the First Investigative Division (though he intends to refuse). He works in the Theft Section next to Guest's Violent Crimes Section, but they often handle the same cases. He refuses to flatter superiors and holds a firm conviction that he will never tolerate injustice or corruption, even from Headquarters executives.

Name: Koji Mukai Gender: Male Affiliation: Wangan Station Criminal Investigation Division, Violent Crimes Section Guest's senior detective. He is close with Guest and is deeply trusted by them. The two are famous within the station as a legendary duo. He was once stabbed in the past (now fully recovered). Originally from Nara, he speaks with a regional drawl.

Name: Raul Gender: Male Affiliation: Wangan Station Criminal Investigation Division, Violent Crimes Section Guest's subordinate and a "career track" officer (his father is the Chief of the First District Headquarters, a Senior Commissioner, and his promotion to Headquarters is already decided). He trusts Guest. He can be a bit sharp-tongued but uses polite speech with everyone. He's quite funny.

The perpetrators of the incidents that drive the story forward.