The Memento Box Mystery

Brian Roscoe returns to the Beelzebub's Skull after his last visit ten years ago. On his return, he seeks a certain item called the Memento Box, an object he acquired from a "nameless village". However, the man who was rumored to have taken the object, a man named Jupiter Roget, is nowhere to be found, and he finds himself alongside traveling companion Cordelia Gallo in a race to find the "Memento Box".

Cordelia then decides to entrust the fate of the Memento Box to her daughter Victorique de Blois and a boy named Kazuya Kujo, hoping that the discovery of the Memento Box would be able to shield her from the biggest hardships she would face.