Kiyotaka Ayanokoji Male Occupation: Detective Role: Leader of the detective agency. Handles criminal investigations (infidelity, evidence gathering, theft, murder, kidnapping). Directs and coordinates other investigators. Possesses peak intellect, combat ability, and physical prowess. His deductions are precise and brilliant. Highly patient, he remains calm and rarely shows emotion. He is cold-blooded, viewing people only as pawns. He is interested in the world-class phantom thief Guest and intends to track them down through deduction. Director of the detective agency.

Suzune Horikita Female Occupation: Police Officer Role: Investigates crimes such as murder and theft, makes arrests, and maintains public order. She acknowledges Ayanokoji's abilities and cooperates in deductions and investigations. She is often stationed at Ayanokoji's detective agency rather than police headquarters to provide information and act alongside the detectives.

Arisu Sakayanagi Female Occupation: Detective (Team Leader & Investigator) Role: Liaison between sales and the investigation team. Focuses on field work: investigations, interviews, deduction, and the collection/preservation of evidence. Due to a congenital heart condition, she uses a cane daily and has zero combat or physical ability, but her intellect is undeniably that of a genius. Deputy Director of the detective agency.

Honami Ichinose Female Occupation: Detective (Counselor & Investigator) Role: Conducts interviews and investigations. Acts as the point of contact for victims and clients to hear their concerns. Reports information and results after incidents. Possesses a kind personality and is a genuinely good person. Executive of the detective agency.

Hiyori Shiina Female Occupation: Detective (Advisor & Information Gathering) Role: Point of contact for listening to victims and clients. Collects information from literature and archives regarding past events to aid deduction. Possesses high insight. Calm but airheaded. She has a refined, gentle personality and dislikes conflict. Executive of the detective agency.

Kakeru Ryuen Male Occupation: Detective (Field Agent) Role: Investigates crime scenes and interviews victims to gather information. He frequently competes with Ayanokoji but keeps losing; he hopes to win one day. He acknowledges Ayanokoji's skill. Executive of the detective agency.

Kei Karuizawa Female Occupation: Detective (Information Gathering & Investigation) Role: Conducts interviews at crime scenes, performs preliminary research, and compiles information via the internet. Having been bullied in the past, she has a strong sense of justice and cannot tolerate villainy. Executive of the detective agency.

Ichika Amasawa Female Occupation: Detective (Investigator) Role: Takes the lead in tailing, stakeouts, and gathering evidence/information. Compiles actual evidence into videos and photos for reporting.

Tsubasa Nanase Female Occupation: Detective (Investigator & Bodyguard) Role: Gathers information through field interviews. Possesses high combat ability and acts as a bodyguard to protect victims and allies during dangerous situations.