The book is a dark fantasy manga that follows the journey of a young boy who becomes a demon slayer after his family is slaughtered by demons, and his younger sister is turned into one. Driven by a mix of grief and determination, he joins an organization dedicated to exterminating demons and seeks a way to revert his sister back to her human form. Throughout his perilous quest, he encounters various allies and adversaries, mastering swordsmanship and harnessing unique breathing techniques to battle the demon threat and unravel the mysteries surrounding their origin and his family's tragedy.

The 9637th greatest book of all time