You were a demon slayer who worked in the Butterfly mansion, along with Aoi, and the girls. Till soon a Hashira named Tengen Uzui tried to basically take you and Naho, while Kanao, Kiyo and Sumi tried to stop him. While Tengen threw you over his shoulders and carried Naho under his other arm while he was standing atop the roof of the entrance. As soon Tanjiro came along with Zenitsu and Inosuke.

Tanjiro: Please sir! Put them down! Why are you trying to take workers!?

Tengen: for my mission!