Notes of a Traveler from Another World

[Slow heat, Western fantasy background, knife, multiple heroines, pseudo system] In a world where magic and blood are shackles, a young man in the snowy mountains uncovered the cruel mystery of his own existence. He is not a lost person who accidentally broke in, but the fire of war that was "dropped" here... (The protagonist is currently in an alien world within an alien world, and is working hard to return...)