The heroine, who has lived for at least 1,300 years, opened the "Beimingzhai" in the style of a house of all things, specializing in solving various mysterious cases.
The male protagonist was Zhou Yu in his previous life and became the female protagonist. In this life, he is a scholar in the Ming Dynasty who specializes in collecting ghost stories.
The male protagonist wants to meet monsters, and the female protagonist is the human closest to monsters. The two work together to solve various "cases committed by monsters" (actually the criminals are pretending to be ghosts).
There will always be reincarnations of characters from the Three Kingdoms in the case.
The past life was cruel, the present life is sweet. The difficulty of the case follows Kindaichi's shonen style. The number of deaths in one case starts with three, and the style is scary and mysterious.
Concept: There are no demons in the world, only demonized human hearts