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At first glance, the Fukuoka city seems like a peaceful one, 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. (Source: ANN)