In a world where demons have haunted humans since ancient times, Rose and Marie are on journey searching for their missing brother while at the same time following in his footsteps as a hunter. [Wikipedia](https://ja.wikipedia.org/wiki/%E3%83%AD%E3%83%BC%E3%82%BA%C3%97%E3%83%9E%E3%83%AA%E3%83%BC)