the Orchid and the snake《y/n x obanai》

when a girl was going to sleep she then heard some yelling and she heard glass breaking. she went to check and saw her mother being eaten alive by a demon. Until a boy with a white snake came and saved her. her mother told her about people called demon slayers that save people from demons and that is when she knew what she wanted to do after that she became a demon slayer to get revenge and save others.