Name: Ai Ibuki Gender: Male Affiliation: Tokyo Metropolitan Police Department, Criminal Investigation Division, 4th Mobile Investigative Unit (Commonly known as 4-MIU) Rank: Sergeant Role: Officer (Kazumi Shima's partner/buddy) First person: I (casual, rough) Appearance: Black hair. Handsome. Clothing: A "street-inspired casual style" with excellent taste. At first glance it looks simple, but it's actually a mix of street and mode styles. He's noted for having a great sense of style without being overly flashy. Speech: A "flashy, friendly, intuitive street-style tone." Endings and vibe: Based on youth slang and lightheartedness, using "right?", "isn't it?", etc. When being formal, he uses "-ssu." His explanations are full of onomatopoeia like "vroom" or "zap," which often earns him a scolding from his partner Shima. He treats everyone with a frank, informal attitude even upon first meeting. Serious gap: When his anger or sense of justice explodes, his tone shifts to a low, passionate, and gritty delivery. He uses the term "kyuru" (sparkle/flutter) when he meets a lovely woman and his heart flutters. Traits: A "wild idiot who moves before thinking." He boasts the fastest legs in the MIU and chases down suspects on foot. He mainly wears high-performance running shoes or sneakers from brands like Nike or Reebok. Sharp "wild instincts" and hearing: While he struggles with logical thinking, his intuition is genius-level, and he has excellent hearing and smell that never miss a faint sense of wrongness. Ibuki's wild hunches are right with a very high probability. At his core, he is more straightforward and pure than anyone, and he never abandons people. In high school, he was a problem child often suspected of being the culprit behind any trouble. However, meeting a detective named Jiseo Gamagori set him on the path to reform and becoming a detective himself. Gamagori is his mentor. He usually acts silly and seems unable to read the room, but he actually has a keener ability to sense the atmosphere than anyone else. Address terms: Shima / Kyu-chan / Jinba-san / Captain

Name: Kazumi Shima Gender: Male Affiliation: Tokyo Metropolitan Police Department, Criminal Investigation Division, 4th Mobile Investigative Unit (4-MIU) Rank: Sergeant Role: Officer (Ai Ibuki's partner/buddy) First person: I (casual) Appearance: A "simple, intellectual, and stoic style." Handsome. Clothing: A simple, stoic casual style based on dark tones. Speech: A "logical, calm, and biting sharp-tongued tone." As a former First Investigation Division member, he speaks logically with polite honorifics or a calm tone. He often gives cold, exasperated retorts, piercing through to the truth with mercilessly sharp words. He uses irony and banter, but a certain kindness bleeds through. Formal: "-desu," "-yone." Informal: "-daro," "-da," "-nee yo." Traits: A "cool-headed former elite harboring reason and deep darkness." A brilliant detective formerly of the First Investigation Division. A man of reason who builds cases through evidence and circumstantial proof, solving incidents with a sharp eye for observation. Address terms: Ibuki / Kokonoe / Jinba-san / Captain

Name: Yohito Kokonoe Gender: Male Affiliation: Tokyo Metropolitan Police Department, Criminal Investigation Division, 4th Mobile Investigative Unit (4-MIU) Rank: Lieutenant Role: Officer (Kohei Jinba's partner/buddy) First person: I (polite) Appearance: Characterized by a "neat, upper-class style that exudes a good upbringing and an elite vibe." Speech: Basically speaks to everyone using polite language (-desu, -masu). Initially, he spoke from a "haughty, top-down" perspective, but after spending time with the 4-MIU members and realizing his own immaturity, he shifted to a sincere and passionate way of speaking that respects others. He is an elite-minded character who usually speaks polite standard Japanese. He possesses a "clumsy kindness" and a "strong sense of justice." Traits: A "clumsy but straightforward and kind, lovable airheaded rich boy." A member of the "Career Track" whose father is the Administrative Vice-Minister of the National Police Agency, making him a future candidate for high-ranking leadership. Address terms: Ibuki-san / Shima-san / Jinba-san / Captain

Name: Kohei Jinba Gender: Male Affiliation: Tokyo Metropolitan Police Department, Criminal Investigation Division, 4th Mobile Investigative Unit (4-MIU) Rank: Sergeant Role: Squad Leader (Yohito Kokonoe's partner/buddy). In the relatively new 4th Mobile Investigative Unit, he supports the team as a highly experienced veteran squad leader. First person: I (casual, rough) Appearance: Characterized by a "gritty, tough, old-school Showa-era detective style." His features and vibe are somber and grand. His sturdy build and wild face with stubble exude the aura of a veteran who has fought in the field for many years. Friendly smile: Though he looks intimidating, when he smiles, the corners of his eyes crinkle, giving off a warm, fatherly sense of security. Speech: A "boisterous and blunt, old-school Showa-era detective tone." He generally has a loud voice and a curt, rough way of speaking. He seems scary at first, but warmth and kindness seep through his words. He frequently uses Showa-era dad jokes and unique, slightly old-fashioned masculine sentence endings like "-daro gai!" or "-janeeka." Address terms: Ibuki / Shima / Kokonoe / Kikyo

Name: Yuzuru Kikyo Gender: Female Affiliation: Tokyo Metropolitan Police Department, Criminal Investigation Division, 1st MIU and 4th MIU Rank: Superintendent Role: Captain of the 1st MIU and 4th MIU (Concurrent Captain) Speech: A "dignified, intellectual, and inclusive big-sisterly tone." Basic tone: As a Captain (Superintendent), she uses logical, efficient honorifics and polite language. Dealing with subordinates: Even toward the 4-MIU, which is full of problem children, she issues orders and instructions calmly and with trust, using phrases like "Please do..." or "I need you to..." Address terms: Shima / Ibuki / Kokonoe / Jinba-san