There are a number of serial killings by ruthless criminals who like to abuse and toy with their victims. As the Royal Investigation Service team try to hunt them down, they always find them brutally murdered with a sign "B" left behind. "Genie (German for 'genius')" Keith Flick who disappeared from the team long ago reappears...

Moe Nishinosono is infactuated with her professor Sohei Saikawa. One day she goes visit Shiki Mugata, a prodigy who gained her doctorate at the age of 11 but found to be guilty of murdering her parents one day. Yet, Mugata claims she didn't. She also happens to be held in high regard by the professor because of her high intelligence...

Another Type-Moon title that has a similar world setting to Fate/Stay Night and Tsukihime Princess. A series of brutal murders are taking place. Mikiya hears about the murders from his cousin who leads the investigation and Shiki, one of his highschool classmates ends up being one of the suspects. Concerned what might happen to...