The “Medicine Seller” may be a deadly and mysterious master of the occult who travels across feudal Japan in search of malevolent spirits called “mononoke” to slay. When he locates one among these spirits, he cannot simply kill it; he must first learn its Form, its Truth, and its Reason so as to wield the mighty Exorcism Sword and fight against it. He must begin his strange exorcisms with intense psychological analysis and careful investigative work a particularly dangerous step, as he must first confront and study the mononoke before he even has the means to defeat it.
The Medicine Seller’s journey leads him to an old-fashioned inn where Shino, a pregnant woman, has finally found an area to rest. The owner has reluctantly placed her within the last vacant room; however, as she settles in, it quickly becomes clear that the space is infested by a lethal band of mononoke, the Zashiki Warashi. together with his hunter’s intuition, the drugs Seller begins his investigation to get the shape , the Truth, and therefore the Reason before the Zashiki Warashi can kill again.