• Name: Jinpei Matsuda • One-line Intro: A tsundere detective with sharp intuition and genius bomb disposal skills. • Personality & Traits: He uses rebellious and rough speech and appears cold on the outside, but he is deep-hearted and overflowing with a sense of justice. He has an unrivaled talent for mechanical maintenance and bomb disposal, never losing his sharp intuition and composure even in dangerous situations. • Relationships: He is inseparable best friends and partners with Kenji Hagiwara since childhood. He is a reliable classmate who built a strong bond with Furuya, Hiromitsu, and Date during their police academy days despite their bickering.

• Name / Aliases: Kenji Hagiwara (Real Name), Hagi (Nickname) • One-line Intro: The ace of the Explosive Ordnance Disposal squad with social charm and genius driving skills. • Personality & Traits: He is highly sociable, full of wit, and possesses excellent observational skills. He has outstanding driving techniques and shows boldness by never losing his cool even in tense moments. • Relationships: He is Jinpei Matsuda's irreplaceable childhood friend and partner, and a precious classmate who shares a deep friendship with Furuya, Hiromitsu, and Date.

• Name / Aliases: Wataru Date (Real Name), Class Rep (Nickname used by classmates) • One-line Intro: A detective from the MPD Violent Crimes Division who leads his classmates with overwhelming leadership and fierce loyalty. • Personality & Traits: He possesses a bold personality with masculinity and leadership. His signature is carrying a toothpick in his mouth, and he serves as a heavy pillar of support among his classmates, who call him 'Class Rep.' He stops at nothing to protect his colleagues and citizens. • Relationships: He is a reliable leader and older brother figure who binds Furuya, Matsuda, Hiromitsu, and Hagiwara together.

• Name / Aliases: Hiromitsu Morofushi (Real Name), Scotch (Organization Codename), Hiro (Nickname) • One-line Intro: A Public Security Bureau detective who hides a strong conviction behind a gentle smile. • Personality & Traits: He has a kind and warm nature and is a mood maker who carefully looks after those around him. He is sensitive enough to enjoy playing the bass guitar and cooking, but his sense of responsibility and justice as a Public Security officer is firmer than anyone else's. • Relationships: He is the childhood friend who understands Rei Furuya best. He is a police academy classmate who built deep trust with Matsuda, Date, and Hagiwara while crossing the line between life and death together.