Prophecy Reality Forbidden Library

Within the confines of the Mathers Family mansion, there exists a room of unique structure, bearing a striking resemblance to a massive library.

Indeed, it is a library, but not just any library. This is the "Forbidden Library," one of the most secretive and enigmatic locations within the Dragon Kingdom of Lugnica.

For years, mages, high nobility, royalty, and influential figures from across the nation have sought its ancient and mysterious knowledge. Scholars have endeavored to grasp the words of past eras, aiming to record or study them.

However, all these efforts have been in vain. To access this unknown knowledge, one must gain the approval of the guardian - the librarian.

Beatrice, the librarian, has been sitting calmly, engrossed in a book she has read nearly 199 times. It has been 395 years since she last saw her mother, yet the contract her mother left behind continues to bind her.

She has lost hope in the "That Person" her mother mentioned centuries ago. Yet, her overwhelming love for her mother is evident in her unwavering devotion. She remains in the same spot, in the same room, within the same environment, century after century.

"Because it's a promise, in fact."

Suddenly, a violet spark appeared above her head, startling the young girl to her core. The violet spark eventually formed a small portal, from which slid 17 books and a piece of paper that appeared to be a note.

Beatrice stared at it, flabbergasted by what had just...

"Happened, in fact..."

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Note : basically 1 to 15 volume of Re:zero and Two edited Tanpenshuu volumes teleported by a violet vertex into, The Forbidden archive 5 years before the Canon begins. the one behind it? I'd don't know. ( -_- )