He pretends to be a patient with a cervical vertebrae sprain to move around the hospital without suspicion. Kusuda flees when his cover is blown but commits suicide when he sees Akai is following him. His corpse is used to fake Akai's death. Ki'ichiro Numabuchi Voiced by (English): Barry Yandell Voiced by (Japanese): Naoki Tatsuta , known as Cornelius Graver in the English dub, is a former member of the Black Organization. In his first appearance, Ki'ichiro becomes the prime suspect in a serial murder case where his driving school classmates were killed one by one. His innocence is proven, and the real killer is brought to justice after a suicide attempt. According to Anita, Ki'ichiro himself is a serial killer, having murdered three people for the thrill of it before the series started. Because of this, he was recruited to be one of the Black Organization's assassins, but Ki'ichiro's mental instability excused him from these duties. He was planned to be a test subject for the APTX 4869 poison. Still, he escaped and killed three additional people he believed to be Black Organization agents. Despite being a ruthless murderer, he calls fireflies his childhood friends. He has a fondness for children, as seen when he carries a lost Mitch to safety who was attempting to collect fireflies of his own. He surrenders to authorities without resistance and awaiting execution for his past murders. Law Enforcement Tokyo Metropolitan Police Department The Tokyo Metropolitan Police is the law enforcement agency of Tokyo Prefecture. The most commonly recurring characters of the Tokyo MPD are members of Division 1 of the Criminal Investigation Section: Inspector Juzo Megure; his subordinate officers, Miwako Sato, Wataru Takagi, Ninzaburo Shiratori and Kazunobu Chiba; and Megure's new superior, Hyoe Kuroda. Officer Yumi Miyamoto and Naeko Miike of the Traffic Division also appear often. Miwako Sato Voiced by (English): Kate Oxley (Funimation); Katelyn Gault (Bang Zoom); Sarah Bartels (Macias Group) Voiced by (Japanese): Atsuko Yuya , Michele Simone as dubbed by Funimation, is a smart, highly attractive, energetic, and a dedicated young female officer who works for Inspector Megure. She is hugely popular with the male members of the police department, but is oblivious to the fact that her colleague Wataru Takagi likes her romantically. However, she gradually develops feelings for him as well. Wataru Takagi Voiced by (English): Doug Burks (Funimation); Christopher Bevins (Bang Zoom); Diego Klock-Perez (Macias