Yoriichikamado cerita

Tanjiro who has become a demon by accident starts his journey with his little sister nezuko. It's not just a role swap au ,it's something more!! What if Tanjiro has been overpowered and mastered total concentration constant breathing since he was 8 years old? What if Yoriichi was the ancestor of tanjiro Kamado? What if the drug to turn a demon into a human was already made? And what if their brother Takeo was still alive? Read out to find out.. The cover and the other pictures does not belong to me......

Ok so this is Sumiyoshi and Yoriichi reborn in the Kamado family, this is inspired by @Sleepysnow01 and @Tsunomi You may think this will turn out normally. But will it?...