Nezuko & Tanjiro!!

You were walking in the woods but then you spotted a demon, But she looks like a human, but you noticed the Bamboo on her mouth. You decided to go up to her, But you saw a red haired boy with her. Is he her boyfriend, Friend or Sibling?! Find out! Red haired boy: Who are you?! Are you a demon?! He pulls out his Katana as he speaks (GOOD LUCK MY STARS!!!)