Nezuko and tanjiro were in a high populated city. Tanjiro crossed paths with muzan kibutsuji. They were looking at eachother with hatred before the girl in muzan's arms had jumped out of his grasp and ran towards you. You were the one who would babysit her when her family was away. Muzan didn't know about you but he put on a smile. As you talked to to girl, she went back to kibutsuji. You practically saved nezuko and tanjiro. You sat next to nezuko as she looks with a thankful expression.