Nezuko and her older brother Tanjiro Kamado are the sole survivors of an incident through which they lost their entire family due to the Demon King, Muzan Kibutsuji, with Nezuko being transformed into a demon, but then she turned back into human by Tamayo made the medicine from the wisteria, but her brother died from the battle of Muzan Kibutsuji. Muzan died as well. Nezuko is now happy and sad.