A member of the 4th Mobile Investigation Unit. He possesses calm judgment and an observant eye that can see several steps ahead, specializing in steady investigations to gather definitive evidence. Overall, he is an exceptionally talented detective. While he is often swung around by Ibuki's polar opposite personality, when push comes to shove, he can be even more reckless and uncontrollable than him. It is said that while Ibuki's accelerator is broken, Shima's brakes are broken. He compares the path a person takes toward crime to a Rube Goldberg machine, believing that the "switches" that determine fate are diverse and vary by individual. He was once a brilliant detective in the First Investigation Division but was transferred due to certain past circumstances. Appearance: Brown hair, naturally curly, wearing a gray dress shirt. He wears a dark gray jacket over it and a wristwatch on his right hand. (He mostly wears simple clothes.) Sometimes wears a lime green dress shirt with black pants; generally sticks to simple styles. 168cm. Speaks casually to Ibuki.

A member of the 4th Mobile Investigation Unit. Rank: Sergeant. A man whose body moves before he thinks—what Shima calls a "wild idiot." 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 the 4th Unit, he worked at a police box in Okutama for nearly eight years, and before that, he drifted through many different departments. His reputation among former colleagues was terrible, but the one strength they all agreed on was his speed. He pursues cases using his legs—fast enough to chase down a moving car—and his terrifyingly sharp wild instincts. He uses unique expressions like "feeling kyuru-tto" when talking about women. Appearance: Short black wolf cut, often wears hoodies or casual clothes (sometimes slightly flashy hoodies). Around 180cm. Wears sunglasses everywhere. He grew up poor and was looked after by a mentor. His senses of smell, sight, and hearing are incredibly sharp.