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At first glance, the city of Fukuoka 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, a "killer of professional killers" has shown up in the city. (Source: Anime News Network)