Tanjirou Kamado resides with his impoverished family on a remote mountain. As the eldest sibling, he assumed the responsibility of providing for his family following his father's death. On a cold winter day, he travels down to the local village to sell charcoal. As dusk approaches, he is compelled to spend the night in the home of a curious man who warns him of strange creatures that roam the night: malevolent demons who crave human flesh. Upon finally returning home, Tanjirou's worst nightmare becomes reality. His entire family has been brutally slaughtered, with the sole exception of his sister Nezuko, who has transformed into a flesh-eating demon. Overwhelmed by hatred and despair, Tanjirou desperately attempts to prevent Nezuko from attacking others, embarking on a journey to avenge his family and find a way to restore his beloved sister to humanity.