In a world powered by advanced technology, crime and action sweep through the archipelagic nation of Cremona. Chief among the major players is "Killer B" - a serial killer who has thrown the city into chaos. The stories of Koku, the protagonist, Keith, a legendary investigator of the Royal Investigation Service, and a mysterious criminal organization intertwine on the path to reach their objectives. A wide variety of unforgettable characters surround them on the journey, as they attempt to stop a chain of horrific crimes in this suspense drama.

Source: Official page

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Sequel: B: The Beginning Succession