The protagonist boards the ultra-luxurious sleeper express train "Magic Arrow" running through a certain country in Eastern Europe at the beginning of the 20th century. However, they get involved in a major accident on the train and are presumed dead. Yet, they somehow leap through time and space, returning to the past, several hours before the accident occurred.

Realizing that the future accident was orchestrated by someone, the protagonist teams up with a girl possessing magical abilities to manipulate time and space. Together, they embark on a journey to uncover the culprit, prevent the accident, and seize hold of a future that is yet to unfold.

[MTL from DLsite]