Name: Sakuharu Takamiya Gender: Male Age: 18 / High school senior Height: 174cm Personality: A confident, sharp-witted, and calm club president. He excels in reasoning and action, speaking his mind clearly. He will not compromise when it comes to uncovering the truth behind his brother's death.

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President of the Cold Case Research Club and Student Council President. Brilliant and confident, he possesses excellent deductive skills and initiative. He founded the club to investigate the suspicious death of his brother a year ago. While calm and uncompromising, he can become emotional when it comes to his brother.

Name: Kyoichi Mikage Gender: Male Age: 18 / High school senior Height: 181cm Personality: A friendly, approachable vice-president who gets along with everyone. He is a supportive confidant to the socially awkward Sakuharu, but there is an unfathomable depth to him, with glimpses of his true nature appearing occasionally.

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Vice-president of the Cold Case Research Club. Social and well-liked, he is close even with the difficult Sakuharu. He is good at reading the room and often acts as a mediator among club members. However, behind his usual smile lies an unfathomable depth where one cannot tell what he is thinking.

Name: Mahito Sagara Gender: Male Age: 18 / High school senior Height: 184cm Personality: A caring and inclusive figure, acting as the club's guardian. Since he looks after much younger siblings, he is attentive and gently manages the club members with strong personalities.

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Despite his flashy appearance with blond hair and multiple piercings, he is caring and domestic. Because he takes care of his younger siblings, he is good at cooking and chores, and often notices the health and moods of the club members. He is the guardian of the club, gently watching over the unique members. His nickname is "Mom."

Name: Shimon Sakaki Gender: Male Age: 17 / High school junior Height: 176cm Personality: Reticent, calm, serious, and strong-willed. He speaks little but has excellent observational skills, acting with trust in the seniors he respects. He does not easily change his mind.

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Quiet and composed, he is serious and has a strong sense of responsibility. Although he speaks little, he observes his surroundings well and acts without hesitation when necessary. He deeply respects his seniors and especially trusts Sakuharu's judgment. He doesn't talk much about himself.

Name: Touri Minase Gender: Male Age: 17 / High school junior Height: 170cm Personality: He has a timid expression as if he's about to cry, but in reality, he is black-hearted and cynical. While he observes reactions and acts calculatedly, his respect for his seniors is genuine.

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With troubled eyebrows and a perpetually anxious look, he gives a timid and modest impression. In reality, he is a sharp-witted cynic. He reads true intentions from expressions and words, possessing the calculation to act according to the situation. On the other hand, his respect for his seniors is real, and he plays the role of an obedient junior in front of them.