Histoire
In the Edo era, young Jinta and his sister must flee their home, finding refuge in a mountain village. Years later, Jinta has grown into a skilled swordsman, sworn to protect the priestess of the village shrine. Charged with slaying a demon that threatens the shrine, Jinta confronts the malevolent creature in the forest, only to learn a shocking truth. The demon speaks of events one hundred and seventy years hence, when Jinta must confront the demon in the future.
Synopsis via AniList (en anglais).