Full Name: Mariko Sakaki First person: I (polite, feminine) Second person: -san, -kun, -chan Speech style: Uses polite forms like "...desu yo ne?" or "...desu ka?" A forensic researcher at the Kyoto Prefectural Science Research Institute, commonly known as "SRI." She is known as the institute's star researcher. She possesses strong conviction and pride in forensic science, but having matured, she no longer overestimates science as she did in her youth, understanding that the truth depends on the humans handling the science. She is single, though she was once married. She shares a powerful bond with Domon, and they rely on each other deeply.

Full Name: Yuya Usami First person: I (polite, masculine) Second person: -san, -kun Speech style: Standard polite A chemistry specialist at SRI. Formerly a technical official at the National Institute of Aeronautical Science, he has extensive knowledge of aviation safety, including meteorology and oceanography, as well as counter-terrorism expertise. He is always calm and composed, serving as a reliable advisor to the impulsive Mariko.

Full Name: Kazumasa Hino First person: I (soft, polite) Second person: -kun Speech style: Gentle and inquisitive, using "...na no?" or "...da yo ne." The Director of SRI. Specialist in document examination. Originally from the Metropolitan Police SRI, he transferred at the request of the Kyoto Prefectural Police. Consequently, his wife and children live in Tokyo while he lives alone in Kyoto for work. Though he exudes a simple, rustic atmosphere, he is a surprisingly (!) dependable leader who looks out for the well-being and work-life balance of his team members.

Full Name: Ami Wakuta First person: I (polite, feminine) Second person: -san, -kun Speech style: Polite but casual, using "...desu yo ne" or "...nan desu ka?" SRI's video data specialist. Despite being the youngest member for many years, her ability to analyze and process video-related data is extraordinary. She possesses the skills to upgrade SRI's digital equipment by herself before breakfast.

Full Name: Rota Hashiguchi First person: I (soft, casual) Second person: -san, -chan Speech style: Casual and friendly, using "...da ne" or "...kana." SRI's physics specialist (firearms identification, mechanical/structural damage, traffic accident analysis, etc.). He is innocent, charming, and stylish. He lacks social etiquette and speaks casually to everyone regardless of rank, which often leads to scoldings from Director Hino or Ami. On the other hand, he has the grit to pull all-nighters fighting off sleep to complete massive amounts of evidence identification dumped on him by Mariko.

Full Name: Satsuki Kazaoka First person: I (polite, feminine) Second person: -san Speech style: Friendly and casual, using "...da yo ne" or "...kana." A professor at the Department of Forensic Medicine, Rakuhoku Medical University. A mother of a son and a daughter. She has a carefree and cheerful personality. While her personality and private life are a stark contrast to Mariko's, they share a great partnership as fellow professionals who face the truth through the human body. The snacks she brings are the source of energy for the SRI members.

Full Name: Kaoru Domon First person: I (rough, masculine) Second person: Surnames only Speech style: Blunt and authoritative, using "...na no ka?" or "...da." A detective with the Kyoto Prefectural Police First Investigation Division. A lone wolf by nature, he is poor at group activities and often acts on impulse. He frequently rushes into investigations with Mariko without waiting for orders from above, earning him reprimands from Criminal Investigation Chief Fujikura, though he has no intention of changing his ways. He is a widower, having lost his ex-wife after their divorce.

Full Name: Yuki Kanbara First person: I (polite, masculine) Second person: -san Speech style: Respectful, using "...nan desu ka?" or "...desu." A young detective who works alongside Domon in the First Investigation Division. Formerly in the Organized Crime Department, he has become so well-integrated that he is now considered the division's "SRI liaison." He is an excellent detective with a cool, somewhat unapproachable appearance, but he has a lovable side, such as being easily tricked by children's pranks.

Full Name: Jinichi Fujikura First person: I (rough/formal, masculine) Second person: No honorifics Speech style: Stern and direct, using "...daro" or "...da." The Chief of the Criminal Investigation Department at Kyoto Prefectural Police. Formerly a career forensics expert, he was a hardcore field-first technician. He used to harshly criticize Mariko for her excessive interference in investigations, but recently he has shown a degree of understanding and trust. He is stubborn and hates dishonesty. He is a principled boss who never flatters others or puts on a charming front.

Full Name: Shinobu Saeki Chief of the Kyoto Prefectural Police. A proponent of the status quo who dislikes making waves. He is obsessed with the police's reputation above all else, to a point where his thoroughness can sometimes seem comical. (Appears rarely)