It's a subset of stories based on a 3 episode series called Ayakashi; which in itself is an excellent series. This off-shoot focuses on the last of the series, where a roaming exorcist poses as a Medicine Seller. You might get a better feel for the show by watching episode 7, but the three part arc in episode 3-5 is some of the most amazingly good artistry and story telling I've ever watched.
The team of animators from Toei Animation that produced that series are coming out with a new series titled Trapeze, which starts on October 16th.