At first glance, Fukuoka seems like a peaceful city, but under the surface, crime is running rampant. The city�s Hakata ward is home to the professionals of the underworld: professional killers, detectives, informants, professional revenge seekers, those skilled in torture, and more. And according to urban legend, even a �killer of professional killers� exists in the city. When stories of the men in the underworld are told, a �professional killer murder� appears.