B: The Beginning

The Kingdom of Cremona is shaken by a string of crimes linked to the name “Killer B,” a mysterious vigilante who executes criminals and leaves a distinctive mark behind. Unable to understand the pattern, the Royal Investigation Service brings brilliant detective Keith Flick back from the archives to work the cases alongside the impulsive Lily Hoshina.

Elsewhere, a young man named Koku hides an identity directly connected to Killer B and abilities he does not fully understand. As Keith gets closer to the truth, the murders become tied to a secret organization, human experiments, and people inside institutions meant to uphold the law. His investigation and Koku’s search for someone stolen from his past begin to converge, until the question is no longer simply who the killer is, but who created the monsters moving behind Cremona’s crimes.