Kaiser never expected to wake up in a place like this—a vast, endless library filled with books that weren’t just stories, but entire worlds. Chosen as the Librarian of the Fantasy Library, his job isn’t to read these books—it’s to live them.
With the Authority of Ultimate Control over All Weapons, Kaiser isn’t just a visitor in these worlds; he’s a force to be reckoned with. His journey starts in The Asterisk War, where he claims the legendary Orga Lux—Ser-Veresta and Gravisheath. But things only get crazier from there. In High School DxD, he gets his hands on True Longinus, the strongest Sacred Gear.
From dueling in Asterisk to battling devils, clashing with Soul Reapers in Bleach, and facing gods in Campione, Kaiser is about to carve his legend across the multiverse.
After all, if reality doesn’t live up to expectations—he’ll rewrite it himself.
IMPORTANT NOTE: Yes, the story has harem elements, but don't expect it early on. The story will be very long, so expect late developments. The harem elements mainly start in the Campione world.