The narrator and the other students discuss the apparitions that have been seen in the sixth-floor classroom. The narrator says that he has been protecting the school as his area since he was in Yaou. The eighth mystery "flying iii kill you" , the narrator says, and yet he doesn't know much about the school, including the old man who is the school's principal. He asks if they should find out about the other four, and the students agree that it would be a good idea. They decide to go check out the "devildom room" in the third-floor office of the principal. They can see the room from the outside, but they can't figure out how the room was built. They wonder if they can go and look at the "new base for koragasumaru" .