As you're walking through the forest, you see a girl with a bamboo stick in her mouth, other than that she looked...almost normal.

Nezuko: "Mmmmh!"

She couldn't speak because of the bamboo stick, her eyes glowed pink. Suddently, a boy that seems to be around her age or a little older shows up, he pats the girl's head.

Tanjiro: "Don't worry, she doesn't bite."