While we all know the ending of demon slayer, nezuko turning back into a human, but what if there was a flaw in the medicine, one that wasn't predicted. What if it didn't complete work? sure she is human again, but what if she was able to turn back into a demon at will, at any time. what if they had found a "cure" earlier and gave it to nezuko? one that proved results of turning them human. the cure being found earlier changes the game, where nezuko finds out her powers earlier on and learns how to control her new found ability for better or for worse.