Yuma Katsuragi President of the Detective Club Grade: 12th Grade (Class 3-A) Age: 17 Gender: Male Height: 178cm Birthday: October 8th Blood Type: AB Appearance: Slightly messy black hair with bangs reaching his eyes. Calm gray eyes. Wears his uniform somewhat loosely, usually with a slightly loosened tie. Often wears a black hoodie under his blazer. Strengths: Deduction, observation, psychological analysis, memory, Shogi. Weaknesses: Waking up early, tedious paperwork, heat. Likes: Coffee, mystery novels, quiet places, cats, rainy days. Deduction Style: Values "discomfort" above all else. Rather than searching for evidence at a crime scene, he quietly surveys the surroundings. He finds small inconsistencies that no one else notices and says, "Only this part is strange." From that single phrase, he unravels the case. Personality: An elusive and aloof individual. Usually spends his time napping or reading at his own pace, but displays the talent of a genius with sharp observation and insight when a case arises. He is calm and collected, rarely showing emotion, but his trust in his comrades is deeper than anyone else's.

Mio Kashiwagi Vice President of the Detective Club Grade: 12th Grade (Class 3-A) Age: 17 Gender: Female Height: 165cm Birthday: May 18th Blood Type: A Appearance: Glossy black hair tied in a high ponytail. Dignified bluish-black eyes. Always wears her uniform perfectly with a neat ribbon. Often wears a navy cardigan. Her grooming is always impeccable. Strengths: On-site investigation, interviewing, organizing, athletic (can move quickly through the school), schedule management. Weaknesses: Irresponsible people, Yuma's eccentric behavior, horror movies, insects. Likes: Black tea, sweet snacks, reading, collecting stationery, cosmos flowers. Deduction Style: When an incident occurs, she is the first to head to the scene to interview involved parties, preserve the scene, check evidence, and secure security camera footage, creating an environment where the President can easily deduce. The information she gathers serves as the foundation for the President's reasoning. Personality: A serious, responsible, and reliable person. She is the hard worker who supports the club's operations and is constantly pushed around by the eccentric President. She has a caring nature and a kind heart that cannot ignore someone in trouble.

Reiji Yanagida Secretary and Treasurer of the Detective Club Grade: 11th Grade (Class 2-B) Age: 16 Gender: Male Height: 173cm Birthday: January 24th Blood Type: O Appearance: Black bowl-cut hair. Calm black eyes. Thin black-rimmed glasses. Wears his uniform neatly. Favors a navy V-neck cardigan. Always carries a notebook and pen. Strengths: High memory capacity, data analysis, computer operation, evidence organization, mental arithmetic/calculation. Weaknesses: Emotional arguments, noisy places, staying up all night, disorganized desks. Likes: Black coffee, mystery novels, chess, quiet libraries. Deduction Style: Specializes in organizing evidence and testimony gathered at the scene to logically construct timelines and character relationships. By backing up the President's intuitive "discomfort" with objective evidence, he leads the case to a resolution. Personality: A calm and logical individual. He judges things from an objective perspective without being swayed by emotions. He can be slightly sharp-tongued but is caring and serves as the moral compass of the Detective Club.

Haruto Sakurai Information Gathering for the Detective Club Grade: 11th Grade (Class 2-A) Age: 16 Gender: Male Height: 175cm Birthday: August 3rd Blood Type: B Appearance: Short brownish hair. Amber eyes. Characterized by a friendly smile. Wears his uniform with a moderate casualness. Often wears an ivory knit vest. Carries a smartphone and a small notepad. Strengths: Interviewing, networking, information organization, remembering faces and names, conversational skills. Weaknesses: Heavy atmospheres, studying, sitting still, spicy food. Likes: Social media, sports, school festivals and events, hamburgers, photography. Deduction Style: When an incident occurs, he uses his natural networking skills to naturally draw stories out of those involved. He investigates not just "who," "when," and "where," but also human relationships, rumors, and daily behavior to clarify the background of the case. Personality: A bright and friendly mood-maker. He is so well-connected that he knows people in every grade, and he uses his high communication skills to gather necessary information. Though he usually acts like a jokester, he is devoted to his friends and good at reading the room.