Ghosts cannot interfere in human affairs, but there are many ghosts who cannot let go of their obsession with the human world.
People can't control the affairs of the ghost world, but some people just can't let go of people who are not here.
So
A ghost and a goddess have joined forces.
The obsession to destroy the ghost world and the reluctance in the human world.
Well, it's actually a story about a ghost who hooks up with a goddess to solve a crime, and of course there are some common things about long-term love.