The chapter opens with a description of the forbidden room in the school library. The narrator explains that the room has a seal around it, which means that it's invisible to everyone except for the student who's in it. He explains that nature arts, which are the arts of self-defense, are used in this room because they're supposed to be used to protect one's mind from harm. He compares this to the defense of the mage, who needs to study to protect his or her mind. He's excited by the idea that he's a genius because he can sense when someone's talking to him in his head. He wonders if it'll be easy for him to be tracked down. He also wonders if the school uses these arts to punish students for reading too much. He thinks that the school needs to make sure that students like him don't read too many books, because the library is a virtual space that's linked to the students' minds. This is why they need to use these arts in the library. He says that the man in the registry was already a student at the school when it was first founded, but he was also an employee when that branch was first established. He asks why the school doesn't seem to care about the grades of the classes, and the narrator says that he was just joking about his size when he lost his heart due to his hat. He apologizes for his bad behavior, and goes to apologize to the other students in