The Wizarding World's Forbidden Book Administrator

Aaron, the librarian who lived forever in the library, spent a thousand years reading all the forbidden books in the library, but he was unable to gain any power.
However, he possesses a book called "The Forbidden Book Borrowing Record." If the target revealed by the book borrows a book from the library and masters the power within it, Aaron will automatically acquire that person's abilities.
When a ragged little girl pushed open the door with a "creak," the quiet library gradually came alive.
Borrowers gradually appeared, and more and more students graduated from the forbidden book library.
They are subtly and imperceptibly changing the entire wizarding world...
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