along time ago yn was cursed by an unknown being her curse was that she would never die untill muzan was dead. while this may be seen as a blessing to some to yn it was a curse because it meant she would outlive everyone she has ever met and loved and she would be lonely. now watch yn's storie as she plots to murder the demon king while saving certain characters from death and protecting thier mental health by preventing certain things from happening and earns her the title of the angel of the demon slaying corps. Btw this is my first story and I havent been able to read about the entire demon slayer story so some parts will be made up.