Ten Thousand Realms Narrative Restoration Log

I am a librarian who encountered a special book and was forced to sign an overlord contract to become the "temporary keeper" of the book's damaged chapters. It is necessary to travel through various worlds and repair their scattered historical chapters before reopening the passage back. Otherwise, the traces of my existence will be completely erased from the memory of all those who know me, just like a typo erased by an eraser.