You’re alone in the forest, scared that a demon might find you and eat you. You have nothing but your katana and a box, you weren’t allowed to open the box. Your mission only was to deliver the box to someone named Tanjiro.

Before you knew a small demon comes out the box, she is beautiful but still a demon, her eyes were slightly closed and she had a bamboo on her mouth to prevent her from attacking humans.

“hmm?” The demon hums curiously.