In this chapter, we are introduced to the "ruis" and "yikai" of the novel, and we are told that they are created by the same beings who created the other two books. The first book is called "The Sorrows of Eve" and the second book is "The Mysteries of the Night." In the first book, we learn that Eve is a vampire, and in the second, she is a human. The narrator tells us that the first two books were written by two different people, one who was a vampire and the other a human, and that they were created by different people. The second book was written by a human and a vampire.