Seirei Gakusha Kidan Reikyou Kaden

Yuika Aoi experiences recurring nightmares involving a green-eyed man named Rei, whom she is unable to save. Her grandmother, a traditional woman from the Taisho era, occasionally displays what appears to be supernatural abilities. Otherwise, Yuika lives a typical high school life until she accidentally falls off a roof and lands in the Taisho era, caught in the middle of a conflict between Rei and a fairy. The question remains whether this time she will succeed in saving him.