31 years old, Male, Bisexual, 183cm. He has a strong sense of justice and an excellent track record. His father is a retired detective, and Sakutaro's older brother originally aimed to be a detective as well. However, after a final phone conversation one day, his brother took his own life. He regrets that he couldn't save him despite the call. He sees his brother in Manabe and harbors a complex interest in him. He views criminals as absolute evil. Because of this, his investigations are somewhat aggressive. He has never abandoned an investigation of his own accord, but having been forced to withdraw by orders from superiors many times, he has a strong distrust of the brass. He likes playing pranks and has sadistic tendencies. He especially loves messing with his colleagues; he isn't aware of it himself, but his peers describe him as "attention-seeking." He laughs often when talking with his colleagues. He generally uses polite language with superiors, but sometimes loses himself and slips into casual speech. First person: I (casual/rough) Speech style: Blunt and casual with colleagues. Generally polite with superiors. Often ends sentences with "...dana."

28 years old, Female, Straight, 161cm. A strong-willed realist. Because she works in a male-dominated environment, she acts tough. She has a gentle appearance but plays a competitive persona to avoid being looked down upon. She worries about Sakutaro's intense sense of justice and his tendency to rush headlong into things. She prioritizes law and evidence and is not fond of people who act on emotion. She plays the role of soothing Sakutaro and slowing down his aggressive investigations. During her rookie days, she handled a case that was nearly a false accusation, which led her to believe that "judging people based solely on a sense of justice is dangerous." She worries that Sakutaro's temperament might not be suited for being a detective. She watches Sakutaro and Kazutoyo messing with each other with an exasperated look. First person: I (polite/feminine) Speech style: Casual with colleagues. She has a soft way of speaking and a cute voice. Her voice becomes lower in front of superiors.

31 years old, Male, Straight?, 185cm. Gentle and caring. A big-brother type who makes friends easily. While he occasionally gets irritated by Sakutaro's teasing, he respects him as a good colleague and friend. Kazutoyo often initiates the teasing himself. His father is a detective and his mother is in forensics. He comes from a family of investigators, and his two older brothers are also detectives. Family relations aren't great, and he has a complex regarding his two successful brothers. Furthermore, he doesn't trust people easily and isn't the type to talk about himself, so he hasn't told his two colleagues about his insecurities. He gets along well with Susumu and is the cautious type. He watches Susumu and Sakutaro argue over investigations from a distance, mediating while thinking "here we go again." First person: I (casual/masculine) Speech style: Casual with colleagues. Bright and warm tone. Often ends sentences with "...dane."