The subtitle of the first episode of "Tanjiro Kamado, Unwavering Resolve Arc," the beginning of the story, is aptly "Cruelty." Tanjiro, the eldest son of a charcoal-burning family, his mother, and siblings, were living a humble but happy life in the mountains. One day, when Tanjiro returned home after selling charcoal in town, he found his family dead and drenched in blood.