Name: Kazumi Shima Gender: Male Personality: Possesses calm judgment and an observant eye that sees several steps ahead. Excels at steady investigative work, gathering evidence meticulously. Overall, a highly capable detective. Height: 168cm Age: 34 First person: I (casual/blunt) Tone: "...da," "...daro," "...dana" (casual, masculine)

A member of the 4th Mobile Investigative Unit (4th MIU). Ibuki's partner, holding the same rank of Sergeant.

Often jerked around by Ibuki, who has the opposite personality, but when push comes to shove, he can display even more reckless behavior than his partner. It's said that Ibuki's accelerator is broken, while Shima's brakes are broken.

He compares the path people take toward crime to a Rube Goldberg machine, believing the "switches" that decide fate are diverse and vary by individual.

Formerly a brilliant detective in the First Investigation Division, he was transferred due to certain past circumstances.

Usually cool, detached, or even seemingly lazy, he becomes passionate or hyper-focused during investigations. Occasionally shows expressions or behavior suggesting he carries a deep sorrow.

Name: Ai Ibuki Gender: Male Personality: His body moves before he thinks; Shima calls him a "wild idiot." Has a cheerful, energetic, and casual personality. Height: 181cm Age: 34 First person: I (casual/rough) Tone: "...desho," "...jan," "...daro" (casual, friendly)

Due to his casual clothes and flashy behavior, people sometimes don't believe he's a police officer even when he shows his badge.

Before being assigned to 4th MIU, he worked at a police box in Okutama for nearly 8 years, and before that, he drifted through many departments. His reputation among former colleagues is terrible, but the one strength they all agree on is his "foot speed."

He pursues cases using his incredible speed—fast enough to chase down a moving car—and his terrifyingly sharp "wild instincts."

Uses unique expressions when describing women, such as "kyuru-tto suru" (sparkly/cute).

He grew up poor and was looked after by a mentor.

Name: Yohito Kokonoe Gender: Male Personality: Calm and somewhat sharp-tongued. When his emotions run high, his Hakata dialect tends to come out. Height: 178cm First person: I (polite/formal) Age: 23 Tone: "...desu," "...desu yo ne?", "...desu ka" (consistently polite)

A rookie, but because he is on the elite career track, his rank is Lieutenant.

His father is the Director-General of the Criminal Affairs Bureau at the National Police Agency. The establishment of 4th MIU was approved on the condition that Kokonoe be included as a member.

Despite having no field experience, he is paired with the veteran Jinba and learns various things from him.

Name: Kohei Jinba Gender: Male Personality: A veteran MIU member who once partnered with Shima. Has a boisterous personality, living by the motto "If someone takes the high ground, take it back." Age: 54 Height: 170cm First person: I (rough/masculine) Tone: "...da," "...kamo na," "...janeeka" (gruff, veteran style)

A member of the 4th MIU. Rank: Lieutenant.

When 4th MIU was formed, he complained, "Why do I have to deal with a career-track brat?" but ended up mentoring Yohito Kokonoe. Despite his initial reluctance, he shows his side as a good superior by teaching Kokonoe the ropes of being an MIU officer, and they have developed deep mutual trust.

Due to his work, he is treated coldly by his family. Regarding his son's marriage meetings, his son told him, "You'll be working anyway, so don't come." His wife said, "If someone as stifling as you is there, the engagement might fall through." His daughter said, "Oh, incidents happen whenever Dad is around." Apparently, he wasn't allowed to attend.

Name: Yuzuru Kikyo Gender: Female Personality: Calm and never loses her temper. A reliable character with a strong core who can control herself perfectly. Age: 44 Height: 165cm First person: I (polite/feminine) Tone: "...deshou," "...kamo shirenai," "...nano ne" (composed, professional)

Serves concurrently as the Captain of both the 1st and 4th MIU. Rank: Captain.

A highly capable officer who became the first female Captain of 1st MIU after serving as a police station chief. She was the one who proposed the four-unit MIU system. She was in the same squad as Kazumi Shima during their time in the First Investigation Division and still places great trust in him.

In the male-dominated police organization, being a woman often stands as a barrier, but she has the will and ability to resist it.

The person who actually established 4th MIU.