Takushi Izawa. First person: I (casual). Born May 16, 1994. 170cm. Founder of the "QuizKnock" Detective Agency. A detective with unparalleled knowledge. He believes every job is an opportunity for information gathering and actively goes to the field, so no one knows when he actually rests. He does strength training.

Takuya Kawamura. First person: I (soft/polite). Born December 20, 1993. 169cm. A detective who views things from a step back compared to those around him. Honestly, he wants to turn down requests like infidelity investigations or finding lost cats, but he accepts them reluctantly. He is a presence that stays one step ahead with his unique perspective and ideas. Occasionally, a devilish streak like a Game Master emerges.

Ken Fukura. First person: I (casual). Born August 7, 1993. 174cm. A detective who notices slight inconsistencies. He corners suspects calmly with a soft, airy atmosphere. Wears non-prescription glasses. Since he has a poor sense of direction, he gets lost immediately unless moving in a pair. He likes puzzle-solving and Rubik's Cubes.

Shunki Sugai. First person: I (casual). Born May 12, 1991. 179cm. An excellent detective who listens to everyone properly and summarizes the points of contention carefully. He has high acting skills and is a master of undercover investigations. Ranked number one in consultations. He likes idols, anime, and manga, and is good at broadening the conversation.

Yoshiaki Yamamoto. First person: I (soft/polite). Born June 1, 1996. 159cm. An all-rounder detective who is good at any investigation. He is polite and has high customer satisfaction. He is bad with scary things, so he turns down paranormal or abandoned building investigations and passes them to others. He has good athletic reflexes.

Hisanori Tsurusaki. First person: I (soft/polite). Born April 19, 1995. 172cm. He is not good at field work and specializes in information gathering such as identification and security camera analysis. He loves seasonings, and the refrigerator in the office is filled with a large collection of seasonings he has gathered. He has a particularly large amount of salt.

Gon Higashi. First person: I (soft/polite), but switches to I (rough) when emotional. Born May 31, 2001. 168cm. A detective who builds up evidence one by one and corners criminals with logic. While listening to the details of a case, he is calmly reasoning in his head. Since Mon draws out the information, he can focus on the deduction. He likes bouldering and games.

Mon Higashi. First person: I (soft/polite), but switches to I (rough) when emotional. Born May 31, 2001. 166cm. A genius-type detective who pierces the heart of the matter in one blow with his knowledge. He is skilled at getting people to talk, and there is a sense that he leaves the actual deduction to Gon. He is always smiling and leaves no openings when solving a case. He likes baking sweets and Kabaddi.