In f.u.kuoka, crime reaches new heights in the seedy underworld. In the Hakata ward of the city, there are various individuals with special talent that consists of professional killers, detectives, informants, and professional revenge seekers. Among those a so-called “killer of professional killers” is becoming more than just an urban legend. Private detective Banba is on the case, but when he uncovers a dark conspiracy, it may be the one curveball he can’t hit.