In Taisho-era Japan, M/N L/N is a quiet and a lovable boy who makes a living selling kimono (Japanese clothing). However, his peaceful life is shattered when a Demon slaughters his entire family. He has no one left in his family, so he decided to take revenge. But was upon meeting a boy with a girl at the snowy mountains. He decided to help the boy to find a way to turn her sister back to normal. The both of them sets out on a dangerous journey and decided to destroy the Demon who ruined their life. Read more to find out! ~This fic will have BL, so if not comfortable, please kindly leave! ~There will be slight cursing! ~There might be a harem! ~This is my own AU!