It Wasn't Meant To Be. (Swap Au)

Tanjiro was supposed to go down the montain that day, but he caught a cold. He begged to go instead of his younger sibling, but his mother forbid him to go. Nezuko went instead. That, is the beginning of our story. [ Since this is a Swap AU, there will be a few diffrent things added, like Shinobu and Giyuu will show up at the beginning, and such. This contains spoilers from both the manga and the series, read at your own risk. Blood, death, and other sensitive topics are included, with a warning before it. That's it.]