In this world, there are a total of four realms, namely the fairy world, the demon world, the demon world and the human world. Those who live in the human world are ordinary humans who only know the world they live in and do not know anything about the world outside it. There is a strange world outside the human world that is both desirable and timid, but few people know about it...
When three teenagers come to the human world for training, what will happen?
Intention: stick to the original intention