Tanjiro Kamado is a kind-hearted and intelligent boy who lives with his family in the mountains. He became his family's breadwinner after his father's death, making trips to the nearby village to sell charcoal. Everything changed when he came home one day to discover that his family was attacked and slaughtered by a demon.
Tanjiro and his sister Nezuko were the sole survivors of the incident, with Nezuko being transformed into a demon, but still surprisingly showing signs of human emotion and thought. After an encounter with Giyū Tomioka, a demon slayer, Tanjiro is recruited by him and sent to be taught by Sakonji Urokodaki, a retired Demon Slayer, to become a demon slayer, and begins his quest to help his sister turn into human again and avenge the death of his family.