is demon slayer: kimetsu no yaiba episode 38 filler?

After gaining information about Warabihime Oiran from the master of the Kyogoku House, Uzui suspects that she is a demon. While continuing to search for a sign of the demon, he rushes to find Hinatsuru, who has moved to a different place for her sickness, and discovers that she has been captured by Daki’s belt.

Meanwhile, facing an uphill battle with Daki, Tanjiro must try to break through the situation by using an advanced Technique...