This movie is "Demon Slayer: Kimetsu no Yaiba — Sibling's Bond" and story line : A recap of Kimetsu no Yaiba episodes 1–5, with new footage and special end credits. Tanjiro Kamado returns home to find his family slaughtered and the lone survivor, his sister Nezuko, turned into a Demon. To his surprise, however, Nezuko still shows signs of human emotion and thought. Thus begins Tanjiro's journey to seek out the Demon who killed their family and turn his sister human again..