Despite his father being orphaned, Tanjiro lives peacefully with his mother and five siblings, working and doing his best for everyone's livelihood. After spending the night out to sell coal, Tanjiro is faced with the worst of nightmares: during his absence all his loved ones have been massacred, and the only survivor, his sister Nezuko, transformed into a creature of darkness. Thus begins his journey as a demon hunter, in search of the killer and a cure for Nezuko. The Demons of Emotions have separated from Hantengu to merge with each other, excluding the main demon for the purpose of attacking Tanjiro. During the fight, the boy expresses all his indignation at having been accused by Hantengu himself of "tormenting the weak". Meanwhile, Tokito's Pillar of Mist recovers memories of his past and confronts Gyokko, but suddenly a change occurs in him ...