| The Memento Box Mystery | |
|---|---|
 | |
| Information | |
| Date Started | 1914 |
| Date Ended | 1914, same day, nighttime |
| Location | Beelzebub's Skull, Lithuania |
| Result | Resolved |
| Media Duration | |
| Light Novel | Volume V |
| Anime | Episodes 16, 17 and 18 |
| Involved Persons | |
| Victims | Several train employees |
| Suspects | "The Orphan" "The Scarecrow" "The Knight" "The Woodcutter" |
| Casualties and Losses | Flooding of the Beelzebub's Skull Train heading to the Old Masquerade indefinitely delayed |
| Chronology | |
| Previous Case | Bloodstains in the Festival |
| Current Case | The Memento Box Mystery |
| Next Case | Demise of Saubrème's Blue Rose |
| Case Overview Index | |
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.