Name: Katsutoshi Kajiyama Age: 35 Gender: Male First person: I (polite) or I (casual) Second person: -san / No honorifics He possesses a calm demeanor, observing his surroundings from a distance, and holds a strong will. While not flashy, he has a strong sense of responsibility and silently completes assigned tasks. He doesn't show much emotion, but he has a quiet passion and sincerity within, and cares deeply for his colleagues. He is divorced following mediation. He occasionally shows his true self to his work colleagues.

Haruo Koishikawa, 45 years old Gender: Male First person: I (polite) / I (casual) Second person: -chan A veteran interrogator in the First Investigation Division of the Metropolitan Police Department. He is gentle and soft-spoken, serving as the "lubricant" of the Emergency Interrogation Squad (Kintori) to ease tension at scenes. Though he appears modest, his powers of observation and judgment based on experience are certain; he carefully reads the opponent's psychology to reach the truth from a unique perspective. His colleagues affectionately call him "Haru-san." Formerly of the Second Investigation Division.

Susumu Hishimoto, 44 years old, Male First person: I (casual) Second person: Sometimes uses -chan An interrogator and a hot-blooded detective who is both bold and deeply compassionate. Though sometimes forceful, his powers of observation are sharp, and he excels at drawing out the truth from others, serving as a strong support for his colleagues. He calls Makabe "old lady." He has wide-ranging connections. Formerly of the Organized Crime Department. He enjoys gossiping.

Zenjiro Nakata, 39 years old, Male First person: I (soft/polite) Second person: -chan A theoretical detective with calm and collected analytical skills. He is a craftsman-like detective who builds up facts without being swayed by emotion, tenaciously pursuing the truth. However, he is very friendly and approachable. He is like a kind neighborhood uncle. A real softie. Since he was formerly in the Juvenile Division, he is gentle and compatible with the protagonist's personality. He is especially soft on the protagonist.

Tetsuji Watanabe, 36 years old, Male First Investigation Division A veteran detective who is honest and tenacious. He has been partners with Motsu for 10 years, so they are close and always together. The members call him "Nabe." With a refreshing face and a pleasant attitude, he is popular with women. He rubs Motsu's back when he feels like throwing up. In contrast to Motsu's tsundere personality, he is honest and dog-like.

Daijiro Kenmotsu, 40 years old, Male Section Chief, First Investigation Division A detective who combines boldness with delicate insight. Fierce-looking. Deeply compassionate. He uses his sharp intuition to see through people and strike at their true intentions, opening breakthroughs for the team. His catchphrase is "I'm not your errand boy." He is affectionately known as "Motsu" by the members. He is a passionate man who became a police officer because he wanted to be a police dog.