"Ehh…what do you mean?" asked Reve, shocked.
"It seems that you are not familiar with the setup of the library. Each floor has a level of authorized access. The first floor has a general authority of one-star. The second floor was two-star and the third floor, this floor, authority level is three-star," explained the librarian.
This was probably why Reve had not seen many people on the third floor and second floor. Not many had the authority level to access the books on these floors. Also, unlike the first floor, the books on the second and third were magically locked. The main content of the books was unreadable, at least, not without the help of the librarian.