Demon Slayer: A Pillar of the Sun Watches the Main Story in an Alternate Timeline

More or less an if-story where the Demon Slayer Corps' Sun Hashira Tanjiro turns dark, and the Kamado Family (Nezuko included) has already been killed off. The Demon Slayer Corps and the others watch the main storyline. The Blue Spider Lily group will also join the viewing later. Once the main story is finished, you can make requests. New author, please be kind. Sorry for any out-of-character moments.