Sachiko

Sachiko is introduced when Keiji and Mikage discover that the noises coming from the attic of the Itsukaichi home are actually her sneaking around. After a quick introduction, Sachiko reveals that she has been living in Keiji's house for the last six months, and claims to have been summoned by our protagonist's bitterness and pessimism.

Despite being a yakubyougami (god of pestilence), Sachiko's power seems to be tied directly to the way our protagonist feels. This means that while our protagonist being content and happy weakens her, she becomes stronger when Keiji is angry or feeling any negative emotions.

Sachiko is cheeky and quick-witted, but prefers to stay in the background to point and laugh at our protagonist and Mikage.