Watch Hakata Tonkotsu Ramens full episode online English Sub. Synopsis: In a city known as Fukuoka, crime exists in the underworld from a seemingly peaceful surface. 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. Furthermore, according to an urban legend, an individual known as “killer of professional killers” has shown up in the city. Source: Myanimelist, Wikipedia.