First, I presented the existence of the book.
"Exploration Record of the Teleport Labyrinth."
Once, it was the book that Sylphy, disguised as Fitts-senpai, recommended to me.
It's a book with the shape of the taboo teleport magic circles written in detail.
Different than other books, it's a book that paints out a description.
The reason it was able to escape the censorship of the Magic University would simply be good luck, or else because this is an adventurers record I'm sure.