Keith is a burned-out cop who knows every move before the killer makes it, except the killer he's chasing doesn't follow any rules that exist yet. Koku exists in a different story entirely, one where redemption and damnation get tangled so tight you can't separate them. The show splits itself in half between a procedural that plays fair and a supernatural descent that doesn't, daring you to figure out which half is lying.
Keith, a veteran investigator for Cremona's elite police unit, finds himself chasing shadows across a sprawling archipelago consumed by violence. Serial murders plague the fortified cities, each crime bearing the signature of Killer B, a phantom whose motives remain opaque. When Koku surfaces in the chaos, his connection to the killings becomes impossible to ignore, yet his nature resists simple categorization. As bodies pile up and the investigation deepens, Keith must confront a conspiracy far larger than any single killer. A shadowy organization pulls strings behind the scenes, orchestrating events through means both technological and inexplicable. The line between hunter and hunted blurs. The rules of criminal investigation crumble against an enemy that seems to operate beyond conventional logic. Paranoia and precision clash as Keith races to prevent catastrophe. Every clue points somewhere new. Every answer spawns harder questions. In a world where technology dominates but mystery persists, survival means accepting that not all threats can be understood, only confronted.