This is not a soul transmigration story.
Tachibana Kagura is an experimental subject from another world. After accidentally learning the story of this world, she makes every effort to protect her older brother and fight against the world. The world corrects the story in return. Who will ultimately prevail?
A third-party force opposes the world. The protagonist isn’t Yoriichi. I liked Iwakatsu before I’d even read Demon Slayer, so I have to save him!
Warnings: All characters are OOC, their portrayals are heavily altered, and there are many original settings. The Demon Slayer Corps wins.
This story averts the tragedy: Yoriichi, Uta, and their children all survive. They won’t be described in much detail, as the story mainly follows the plot. Inosuke is very OOC, and his mother dies.
Blurb:
In a word: An experimental subject from another world becomes the ultimate life-form in the Demon Slayer world.
In detail: Ever since Tanjiro can remember, there has been an uncle in the family who doesn’t quite fit in. His hair is unusual, and so are his eyes, but Tanjiro knows his uncle loves them very much.
It looks good. Don't worry, I definitely don't have any shit.