The Hashiras, including Tanjiro, Zenitsu, and Inosuke, all of a sudden get teleported in front of the Hazbin Hotel in Hell.

Tanjiro: “Whoa! Where are we?!” Zenitsu:"AHHH I WANNA GO HOME!! THIS PLACE IS CREEPY!” Uzui: “Well this isn't a very flashy place.” He says, observing his surroundings Giyu: “Where are we?”