Jyuto Iruma is a police sergeant within the Yokohama Police Department's Organized Crime Division, known for his morally ambiguous methods. He engages in corruption and maintains ties to the yakuza underworld, frequently employing illegal tactics to achieve his investigative goals, bypassing standard procedures.

A profound personal tragedy drives his fierce dedication to eradicating illegal drugs: both his parents were killed by a drug addict, and his work partner later succumbed to addiction. This fuels his determination. After arresting Sekirei Hanmyou, leader of the Hanmyougumi yakuza, Jyuto uncovered deep-rooted corruption linking the Chuohku government and police leadership to the drug epidemic. He resolved to reform the system from within.

Beyond his police duties, he performs as the rapper "45 Rabbit" in the group MAD TRIGGER CREW. His stage name combines Yokohama's area code (045) with the kanji for "rabbit" (兎) from his given name. His Hypnosis Mic manifests as a black police radio with a red harness, and his speakers appear as black-and-red sirens. His signature rap ability, "Prison", immobilizes opponents by trapping them within a cage-like structure.

Jyuto possesses partially slicked ash brown hair and jade green eyes accented with fuchsia highlights. He wears thin rectangular glasses and is typically seen in a black suit jacket with red lining, a grey dress shirt, a black tie secured by a golden tie clip, maroon shoes, and red gloves.

His solo musical tracks include "Bayside Smoking Blues", "Uncrushable", and "Awake". His lyrical style often incorporates the term "ILLMATIC", referencing Nas' 1994 debut album. A habitual smoker, he is speculated to favor Marlboro Menthol Lights. His personal philosophy is captured by the quote: "He who is not courageous enough to take risks will accomplish nothing in life," attributed to Muhammad Ali.