Demon Slayer: Kimetsu no Yaiba is a Japanese manga and anime series Kimetsu no Yaiba is set in the Taisho era, Japan. The life of Tanjiro Kamado, a kindhearted boy who sells coal for a living, changes one day after his family is murdered by a demon. In order to turn back his sister, the only one who survived but turned into a ferocious demon herself, the two go off on a journey to seek the demon who killed their family.