Why Did the Presiding Judge Wear a Model Again?

There are rumors from the outside world that the Heretic Tribunal imprisons countless demons and seals countless extremely evil people. On this day, little Claire finally plucked up the courage and came to the deepest part of the Inquisition Bureau. It's cold, dark, and the dim gray light makes people feel dizzy. The strange thing is that she didn't see any demon here, only a boy holding a bottle. The boy was also flipping through a book that was taller than himself. Because she can't read yet, Claire can only guess... Could it be, That book is the rumored "Necronomicon"! Or the "Forbidden Index" from the Magic Academy! The boy shook his head and told little Claire: "This is the second volume of "Advanced Mathematics", published by Tongji University."