Multiverse: Library Novel

Kaiser awakens in an infinite library where books are not mere stories but living worlds. As the newly appointed Librarian of the Fantasy Library, he must experience these realities firsthand rather than simply reading about them. Armed with the Authority of Ultimate Control over All Weapons, Kaiser becomes a formidable presence across multiple dimensions. His adventures begin in The Asterisk War, where he acquires the legendary Orga Lux weapons Ser-Veresta and Gravisheath. His journey escalates in High School DxD as he claims True Longinus, the most powerful Sacred Gear. From competitive duels in Asterisk to confrontations with devils, battles against Soul Reapers in Bleach, and conflicts with deities in Campione, Kaiser forges his legacy throughout the multiverse. When reality falls short of his expectations, he takes matters into his own hands and reshapes it. Note: This story features harem elements that develop gradually, primarily emerging during the Campione arc.