As its name suggested, it was the largest and oldest library in the world.
All the books about anything in the world were in here, and the only problem was whether people could find them or not.
From the 1st floor to the 79th floor were just ordinary books, not worth mentioning.
However, on the 80th floor, which was also the highest floor, those books were the keys to the ultimate knowledge.
The knowledge of the gods, the cursed things.
And, those books also had another name:
Things that should not exist in this world.
On the 80th floor, the librarian was sitting leisurely, enjoying this evening.
However, the peaceful atmosphere he had created was ruined when one of his employees appeared.
"Sir, something really bad happened!"
Frowning, he shouted:
"Shut up! This is a library!"
Realizing his irresponsibility, the employee immediately covered his mouth.
The librarian asked again, rubbing his temples with both hands.
It seemed that he was not very happy to be disturbed during his rest time.
"Yes, sir, there is currently a madman on the first floor destroying everything that comes into his sight!"
The librarian raised his eyebrows.
"And he is gradually moving up to the other floors. The situation is extremely bad! Many books have been destroyed by him!"
The librarian waved his hand indifferently.
"Just send some security guards there."
The employee hesitated, before saying another shocking news:
"...We did that... but they were all taken down by him."
"All of them? Who is he to be able to do that?"
"I don’t know, sir. He wore a white mask, so no one could guess his identity."
The librarian’s interest in that person grew.
But at the same time, he also sensed that something was wrong.
"So... could you, the librarian of the World Library, the strongest person in this place, help us suppress that guy?"
With a sigh, the old librarian stood up.
The moment the two of them left, a shadow entered the 80th floor – a forbidden area because its knowledge was too terrifying to handle.
Halfway through, the librarian suddenly frowned.
He felt that something was wrong, and that anxiety was growing in his chest.
"Is there something wrong, sir?"
"...Now that I think about it, it doesn’t make sense at all. We, the World Library, have never offended anyone, so why would a madman attack this place?"
"Moreover, doesn’t he know that attacking the World Library head-on is the most foolish thing to do?"
There were only two reasons to explain this abnormality.
First, that person was extremely strong, so strong that he looked down on everything.
But that was impossible.
Because even one of the Seven Great Heroes couldn’t possibly confront the entire World Library.
The second reason was...
"That guy who attacked us was just a decoy..."
Thinking of this possibility, the librarian’s footsteps immediately stopped.
His expression shifted.
Then, he looked up at the 80th floor.
"...Don’t tell me..."
"What’s wrong, sir? Why did you suddenly stop?"
Realizing that he had been tricked, he shouted.
"That crazy guy was just a decoy! Their purpose was to lure me away, so that someone else could go to the 80th floor!"
Then, without hesitation, the librarian immediately turned back.
It had been almost 30 minutes since Erza attacked the World Library.
But the strange thing was that to stop the prince, the World Library only sent out small fry guards.
People that he didn’t even bother to look at.
Shouldn’t they have realized Erza’s power by now?
And then sent the librarian to confront him?
But until now, that person still hadn’t appeared.
A glint of gloom flashed in Erza’s eyes as he thought about that possibility.
Their plan had been discovered by him.
If that was the case, then that was bad, because Kael had absolutely no chance of winning against that damn librarian.
"Bastard! Where are you looking!"
A guard rushed towards Erza.
But the prince didn’t even need to glance at him to be able to slash through the man’s neck.
If that was true, then the prince shouldn’t be here any longer.
He needed to go up there and help Kael.
But, just as he was about to run, suddenly, from above, something huge fell.
The thing made contact with the floor, causing dust to fly everywhere, and at the same time, crushed a few guards to death.
Erza covered his nose and mouth, then slowly approached the object that had just fallen.
And when he saw it, his eyes couldn’t help but widen in surprise.
"This is the bookshelf on the 80th floor, right?"
But that wasn’t all, because right after that, more bookshelves fell from above.
A smile involuntarily appeared on the corner of the prince’s lips.
"I understand your intentions, Kael!"
After successfully bypassing the librarian and being able to enter the 80th floor, Kael tried his best to find the book he and Erza needed.
[How to revive the demon king.]
It sounded ridiculous, but it was the truth.
This was the World Library, where all questions had answers.
However, a problem arose.
"Damn it! Why is this place so massive!?"
With just a glance, he could already tell that this place was larger than a stadium.
And so, it must contain at least 100 million books.
He tried his best, but the speed was still too slow.
It felt like looking for a needle in a haystack.
And as if to make things worse, the heavens sent that person back to the 80th floor.
From behind, Kael could hear an old voice.
And indeed, the owner of that voice was just as old.
It was an old man, around 70 years old, with long silver hair that reached his back, and wearing a black robe.
"You are... the librarian?"
Without hesitation, he replied.
At the same time, he took a step closer to him.
"If you and the person below leave right now, perhaps I will spare you a way to live. What do you think?"
Kael was stunned by the librarian’s leniency, yet, he still sighed in the end.