Mononoke

Mononoke (モノノ怪) is a Japanese animated television series produced by Toei Animation. A spin-off of 2006's horror anthology series Ayakashi: Samurai Horror Tales, Mononoke follows the character of the medicine seller as he continues to face a myriad of supernatural perils.
The wandering, nameless character known only as the "Medicine Seller"  always proceeds in the same manner, using his knowledge of the supernatural to fend off the mononoke until he can learn the spirit's shape (Katachi), truth (Makoto) and reasoning (Kotowari). Only then can he unsheathe his sword and exorcise the demon.