Murder is on the rise, and the bodies keep piling up. For police officer Isogai Shiro, solving these killing sprees is his sole purpose. He'll stop at nothing to find these deranged murderers and has thrown himself entirely into the investigation.

So when a mysterious informant begins tipping off the police about serial killers before they strike again, Isogai sees a chance at a breakthrough. But the source isn't at all what he expected: a young woman named Hinata Kuroi who seems to have a "sixth sense" that helps her find killers.

Together, this unlikely duo dives into the city's darkest corners, hunting monsters in human skin. Because for Isogai, this is more than justice--it's personal.