The evil energy carried by monsters will have a bad impact on the human body, and unpredictable mutations will occur if they live together for a long time. Despite this, there are still many monsters who want to stay in the human world.
Over time, monsters started companies in the human world, built apartments, and even established hospitals, schools, supermarkets, etc., Just for monsters to work and live.
The monster shelter will take in monsters who are temporarily homeless and homeless. It is also an agency responsible for publishing recruitment and leasing information.