In a quiet mountain temple, Tanjiro Kamado, a 3-year-old boy, sat in the centre of the fireplace warming himself. He looked up at his mother, who had just returned from drawing water from the well. Tanjiro always wondered why his mother never smiled since the demon appeared.

"Mama? W-when can Tanjiro see mama smile again?"

Tanjiro approached his mother, he bowed his head he was embarrassed to ask such a question.