is demon slayer: kimetsu no yaiba episode 6 filler?

Tanjiro is now clad in the uniform of the Demon Slayer Corps. His Nichirin sword on his hip, and Nezuko, now awake, in a special box made by Urokodaki on his back, he heads out for his first assignment: a town to the northwest where girls have been vanishing nightly.

There, Tanjiro meets Kazumi, haggard with worry after his girlfriend has been abducted. Though he does catch the scent of a demon nearby, none are in sight.

Tanjiro is sure that a demon is behind this sinister incident...