The premise is so deranged it shouldn't work: a serial killer on the government payroll hunting serial killers. It works because the show commits completely to the absurdity and never winks at the camera. Kuroko is exactly as broken and genuinely pleased with this arrangement as she should be, and watching her operate inside the system that's supposed to contain her is the whole point. The show understands that the fantasy isn't morality, it's permission.
Kuroko Koumori is a serial killer with a particular set of talents: she's efficient, methodical, and unburdened by conscience. Rather than rot in prison, she strikes a deal with the Tokyo police department. They give her a badge, a gun, and a simple mandate: hunt down and eliminate other dangerous killers operating in the city. It's a twisted arrangement, but it works. The department gets results without paperwork, and Koumori gets something she never expected to find: purpose. What unfolds is a dark comedy built on the absurdity of a murderer working for law enforcement. Koumori approaches her new career with the same cold precision she brought to her old one, except now she's technically on the right side of the law. Her coworkers struggle to process her unsettling presence while she treats assassinations like any other job assignment. Between contract kills, she navigates workplace dynamics, moral ambiguity, and the question of whether redemption is even possible for someone like her. This show caters to viewers drawn to morally grey characters and situations where the usual rules don't apply.