Demon Slayer

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.