At Saint Marguerite Academy in Sauville, Kazuya Kujou, a Japanese transfer student, faces ostracism due to his foreign appearance, earning him the moniker 'Black Reaper.' His routine pursuit of ghost stories in the opulent library takes a turn when he discovers a golden hair strand, leading him to encounter the enigmatic Victorique de Blois. Victorique, possessing extraordinary foresight, and Kujou find their destinies intertwined as they navigate a series of puzzling events, from a phantom ship to an alchemist wielding transmutation powers. Bound by fate and their unique abilities, the duo must forge an unlikely partnership to unravel the escalating mysteries.