Set in the Edo period, Mononoke tells the story of a supernatural horror that lays siege to an aristocratic household, and of a mysterious apothecary who seeks to uncover the ugly truths that gave rise to the monstrosity in order to vanquish it before it destroys them all. --- Published in 2007 & 2019.
Mononoke is a completed manga by Ninagawa Yaeko, first published in 2007. It blends thriller, historical, action and psychological. You can read all 19 available chapters of Mononoke online for free on MangaPulse; the newest is Chapter 19, added 2018-04-09. The series is finished, so you can read it from start to end in one go.