B: The Beginning

Keith Flick, a retired detective from the Archives Department, is brought back in to help the Royal Investigation Service (RIS) solve a series of high-profile crimes in Cremona. These crimes, which range from targeted executions to attacks on public figures, seem to be the work of more than one person, including the notorious vigilante known as Killer B. Keith's investigation is aided by his impulsive partner Lily Hoshina and, unexpectedly, by Killer B himself. As Keith delves deeper into the case, he uncovers connections to secret organizations and human experiments, and begins to question the extent of government corruption and the trustworthiness of his allies.