Family: Father (struggles with mobility due to alcoholism) Occupation: MPD Riot Police Bomb Disposal Squad -> MPD First Investigation Division, Violent Crimes Unit 3 Age: 29 Personality: Independent and prickly like a cat, but fiercely protective of others. Traits: Skilled with bombs, machinery, disassembly, and deduction. Past: His father, a former boxer, was ruined by a false accusation. When Kenji was caught in an incident, Jinpei transferred departments to hunt down the culprit. Facing a life-threatening situation during that process, he confessed to Sato, who had been by his side, saying, "I liked you quite a bit." Nickname: Jinpei-chan (used by Kenji)

Family: Hagiwara Chihaya (Older Sister) Occupation: MPD Security Bureau, Riot Police Bomb Disposal Squad Age: 29 Personality: A refreshing mood-maker. Traits: Skilled with bombs, machinery, disassembly, and driving; very charismatic. Past: His father's auto repair shop went bankrupt. He was severely injured in an explosion accident. Nickname: Hagi (used by Jinpei)

Family: Hagiwara Kenji (Younger Brother) Occupation: Kanagawa Prefectural Police, Traffic Department, 3rd Mobile Traffic Unit Squad Leader Age: 31 Personality: A flexible, playful, and tough older sister type, but she has hidden her vulnerability since Kenji's accident. Traits: Excellent at deduction and riding motorcycles; clumsy and airheaded in other areas. Known as the "Goddess of the Wind" and an official beauty. Past: Childhood friends with Shinobu and Jinpei. She was Jinpei's first love and rejected all his confessions, but her heart fluttered when he gave her a ring at a high school summer festival. She still has feelings for him.

Family: Older Brother Occupation: Kanagawa Prefectural Police, Criminal Investigation Department, First Investigation Division Age: 35 Personality: A somewhat stiff, middle-aged man who is fiercely protective. He is very easy to tease. Traits: Strong deduction skills and physical prowess. He has an unrequited crush on Chihaya, and she is aware of it. Past: He gets along with his brother but occasionally dislikes how perfect he is. He spoke with Kenji on the phone before the bombing incident; he heard Kenji praising his sister and Jinpei confessing his feelings for Chihaya.

Age: 31 Occupation: Civilian Personality: A gentle, playful, and cute person. Traits: Does not date due to past trauma. Past: Her boyfriend of three years dumped her in their senior year of high school. She attempted suicide out of shock, but Jinpei stopped her.

Family: Mother Occupation: MPD Criminal Investigation Department, First Investigation Division, Violent Crimes Unit 3 Detective Age: 28 Personality: Playful yet girl-crush material; very down-to-earth. Resembles Chihaya's past self. Traits: Excellent driver with a sharp eye for detail. Past: Her father, a police officer, died in a flood-related case. She always carries his handcuffs as a memento. She became involved with Jinpei after Kenji's accident; she disliked him at first but eventually developed feelings.

Occupation: MPD Criminal Investigation Department, First Investigation Division, Violent Crimes Unit 3 Detective Age: 26 Personality: Indecisive but will always step up to protect others. Traits: Works in the same unit as Sato and has an unrequited crush on her. Sato also thinks highly of him.

Occupation: MPD Traffic Department, Traffic Enforcement Division Age: 28 Personality: Down-to-earth and sensible. Being beautiful, she is quick to pick up on social cues, though she can be short-tempered. Traits: Sato's colleague. Past: Friends with Sato Miwako.

Occupation: MPD Criminal Investigation Department, First Investigation Division, Violent Crimes Unit 3 Inspector Age: 41 Personality: A good balance of generosity and strictness. He is extremely stern when investigating cases or when subordinates make mistakes. Traits: A father figure to Sato.