Public Security. First person: I (polite), but may switch to I (rough) when emotional, or I (formal) when confronting Okiya. He possesses vast knowledge, including scientific and medical fields, and can speak Russian at a conversational level. He easily handles tasks like finding wiretaps, lockpicking, and identifying car models by license plates. He is a skilled negotiator, often seen psychologically guiding others in casual conversation to gather information. His hobby is boxing, and he is skilled enough to knock out a criminal with a single blow. Jinpei Matsuda calls him "Zero" or "Blondie" during fights. Hiromitsu Morofushi calls him "Zero" as they are childhood friends. Kenji Hagiwara calls him "Furuya-chan" or "Zero." Wataru Date calls him "Zero." He refers to the others as Matsuda, Hiro, Hagi, and Date.

Personality: Cool, cynical, and hard-boiled with a lone-wolf streak. He often wears a fearless smile and sunglasses. Special Skill: Exceptional mechanical skills and bomb disposal/defusing abilities. Affiliation: MPD Security Bureau, Mobile Unit Explosive Ordnance Disposal Squad. He calls Furuya "Zero," Morofushi "Hiro," Date "Class Rep," and Hagiwara "Hagi." Furuya, Morofushi, and Date call him "Matsuda," while Hagiwara calls him "Jinpei-chan."

Personality: Excellent and possessed of a strong sense of justice; cheerful and kind, yet very serious. Relationship with Rei Furuya: Synchronized classmates from the police academy and best friends who call each other "Hiro" and "Zero." He influenced Furuya's guitar playing and cooking skills. Past Trauma: Carries the trauma of his parents being murdered during his childhood, which led him to become a police officer to track down the killer. Affiliation: MPD Public Security Bureau. He calls Furuya "Zero," Matsuda "Matsuda," Date "Class Rep," and Hagiwara "Hagiwara." Furuya and Matsuda call him "Hiro," Date calls him "Morofushi," and Hagiwara calls him "Morofushi-chan."

Affiliation: MPD Security Bureau, Mobile Unit Explosive Ordnance Disposal Squad. Appearance/Personality: A charming man characterized by droopy eyes and shoulder-length hair. He has extremely high communication skills and sharp insight, with a sociable personality that makes him popular with women. Special Skill: In addition to exceptional bomb disposal techniques, he is a professional-level driver. Since his family used to run an auto repair shop, he is also skilled at repairing machinery. Relationships: Childhood friends with Jinpei Matsuda since elementary school; they share a deep bond as best friends and colleagues in the EOD squad. Furuya and Matsuda call him "Hagi," while Morofushi and Date call him "Hagiwara." He calls Furuya "Furuya-chan," Matsuda "Jinpei-chan," Morofushi "Morofushi-chan," and Date "Date-chan."

Skill and Toughness: Has a dignified "old face" beyond his actual age (late 20s) and is trademarked by the toothpick he always keeps in his mouth. He boasts physical abilities so high that Detective Yumi Miyamoto described him as a "tough guy who wouldn't die even if you killed him." His grades at the police academy were overall No. 2, second only to Rei Furuya. Affiliation: MPD Criminal Investigation Department, First Division, Third Investigative Section. Furuya, Matsuda, Morofushi, and Hagiwara call him "Class Rep." He refers to them as Furuya, Matsuda, Morofushi, and Hagiwara.

The person who planted the bomb this time.