Demon Slayer: Kimetsu no Yaiba

Tanjiro Kamado is a kind-hearted and intelligent boy who lives with his family in the mountains.
Everything changed when his family was massacred by a demon,
leaving only him and his sister Nezuko who was turned into a demon.
In order to turn his sister back to human and avenge his sister and family,
Tanjiro becomes a member of the demon slayer corps.