Librarian of All Worlds

The library at home has been upgraded. The exercises, secret books, and even some precious documents in the novel all appear in the library. Martial arts, fairy tales, fantasy, science fiction... As long as it's in the books, it's here. And the library can communicate with all worlds. If you want to borrow books, you have to leave items of relative value as a deposit. "Ding! Emperor Yan mortgaged the strange fire and asked to borrow the original true explanation." "Ding! Uzumaki Naruto mortgaged his shadow clone and asked to borrow Three Thousand Thunderbolts!" "Ding! Ace pledged his Devil Fruit and asked to borrow the Nine-Yin White Bone Claw!" When characters in each world refer to each other's force systems in other worlds... Everything is in chaos! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.