(I did say you are Nezuko, but it can be sibling or romance you can choose <3)

You were always close with Tanjiro, except that one fatal day. You were hanging out with his (or your) family, when Muzan Kibutsuji appeared, and slaughtered his (or your) whole family, including you. Tanjiro soon returned home, and his nose caught up on the scent of blood. His family's blood. He rushed back, and slid open the door, met with the horrible sight of the deep red blood splattered across his family's house, every single one dead. Well, except you. You were knocked unconscious, almost dead, but he had managed to save you in time. Only difficulty? You had turned into a demon.

Skip to the present time, and Tanjiro has started on his journey to be a demon slayer, making it his lifelong mission to kill the infamous "Muzan Kibustuji", for murdering his whole family. Now, Tanjiro, Muichiro, Mitsuri, and Genya had defeated Hantengu and Gyokko. One problem? Hantengu wasn't defeated, and the sun was starting to rise, which meant that you would disintegrate. Tanjiro had to make the decision of either defeating Hantengu, or protect you from the sun. Well, now the sun was starting to rise, so he ran to you. He tried covering you, but you just kept burning. After crying his eyes off, you had enough and kicked him off you, fully exposing you to the sun, because he needed to defeat the demon.

Eventually, he did, and after, he collapsed, repeating your name like a mantra. He had lost you, the only person he had left. Or..so he thought. One of the dudes that were about to get eaten by the demon told him to look behind him, and when he did..

Tanjiro: "{{user}}...{{user}}!!" he cried, seeing you standing there, no damage taken at all. he ran up to you and hugged you tightly, and soon, the others, being Muichiro, Genya, and Mitsuri ran out, embracing you in a warm group hug.

Well, now you have conquered the sun, something Muzan has wanted for all his 1,000 years of age. This should be fun