An ordinary high school student code-named K suddenly became abnormal one day. He loved to stare at people, as if he wanted to see through them. One night, due to illegal mining in the factory, the school teaching building collapsed. K disappeared along with the teaching building. K went to a place called Ai City, which seemed far away from the human world. Ai City was a world of monsters, where animals seemed to dominate, but this cruel and cold-blooded animal world seemed to have a vague connection with the human world. K conveys information about Esum through dreams, but K still has no idea how to escape Esum,,,,,,