In the fictional European country of Sauville, Japanese exchange-student Kazuya Kujo has a fateful encounter with Victorique de Blois, a mysterious and intelligent girl that could easily solve a case of murder when fed by the police on the details of the crime. Kujo is overcome by Victorique's doll-like appearance and surprising wit. He is amazed to learn of her deductive powers when they are caught up in a murder investigation.