Between the human world and the underworld, there is a vast and barren world, which is unknown to mankind, not under the control of the underworld, and forgotten by the gods. And those who know this place call it the Lost Land, also known as the Lost Ghost Domain. There are no people, no animals, and no ghosts. But there are creatures that are more terrifying and disgusting than ghosts. They are known as the Lost! The Lost are ugly and ...... Weird. They have no intelligence, and their kind of people cannibalize them, and the humans who strayed here are like sheep in a wolf's den, and they cannot escape their poisonous hands. There are some powerful monsters, although they have no intelligence, but they can use their strong lost power to break through the space and enter the human world, slaughtering humans! Everything in the world is mutually reinforcing, and if there are monsters, people will naturally spawn against monsters! These people are called psionics. The powerful Lost have the ability to enter the human realm on their own, and the psionic are responsible for the peace of the human realm. This is an ordinary story of eliminating demons and protecting the human world. But one day, the psionics discovered that those confused lost people seemed to have given birth to intelligence, and things developed in an uncontrollable direction......