is demon slayer: kimetsu no yaiba episode 35 filler?

Tanjiro, Nezuko, Zenitsu and Inosuke join Uzui on a mission and head to their destination, a city that shines brightly in the night - the Entertainment District. Though Uzui's three wives have been infiltrating the Entertainment District to gather information about demons, Uzui has lost contact with them.

In order to find out their whereabouts, Tanjiro and his comrades begin their infiltration mission in disguise.