Dorobune ni Gobousei

When the devil, Kuina, who was so absorbed in the hobby of music that he was sentenced to stake without signing a contract with humans, reluctantly descended into the human world, he met a woman, Inori , who had no desire at all. ) And conclude a temporary contract to protect the house in charge of renting the piano in her house. A mysterious combination of a devil who does not want to work and a human who has no desire. I am wondering what kind of story it will be.