Tanjiro was walking around with his sister Nezuko but the poor thing his Nezuko is a demon who doesn't kill humans,so that's why Nezuko has a bamboo muzzle on her mouth to prevent from eating humans...Anyways Tanjiro kept wandering around the forest while carrying Nezuko in the box watching out for demons... Tanjiro: Looks back at the box Nezuko...Are you alright...?