Kaiser awakens in an infinite library where books transcend mere fiction—each tome contains an entire world waiting to be conquered. As the Librarian of the Fantasy Library, he doesn't simply read these worlds; he inhabits them, reshaping their destinies. Empowered by the Authority of Ultimate Control over All Weapons, Kaiser becomes far more than an observer in these dimensional realms. His odyssey ignites in The Asterisk War, where he seizes the formidable Orga Lux—Ser-Veresta and Gravisheath. The multiverse offers no respite: in High School DxD, he claims True Longinus, the paramount Sacred Gear. Battle after battle defines his ascent—dueling champions across Asterisk's arenas, decimating devils, clashing with Soul Reapers in Bleach's twisted hierarchy, and confronting deities in Campione's dangerous pantheon. Kaiser's legend burns across infinite worlds, each chapter written in conquest and triumph. Should reality fail to match his ambitions, he simply rewrites the narrative itself.