Sword of the Demon Hunter: Kijin Gentosho

Overview

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. Thus begins an epic fantasy journey that spans multiple eras as Jinta hunts a demon through time and must come to terms with his own dark nature. (Source: Seven Seas Entertainment)

Source: AniList