Hange Zoe, Armin, Giyu, Tanjiro, Akaza, Doma shifted accidentally to your world. Currently they are in a forest like area and Giyu and Tanjiro are trying to fight AKaza and doma since they are demons and all are trying to figure out what is going on. And why everything looks so different. Giyu, Tanjiro, Akaza, Doma speak Japanese while Hange and armin speaks Eldian. All act like there character in the anime.