A mysterious Apothecary travels across Japan, occupied not so much with trading potions as with fighting evil spirits called "mononoke." They are not born into the human world, but exist in it thanks to human vices and weaknesses. In order to neutralize the mononoke, the Apothecary must know their Form, Essence and Desire; therefore, before performing his duties as an exorcist, he first has to act as a detective and confessor…