Weakest Noble? NO, He Got Ancient All-Skill Book and Became Emperor's NIGHTMARE!

After getting hit by the legendary *"sleeping-at-work truck-kun equivalent,"* this office worker wakes up as the kingdom's most notorious noble brat — a guy so embarrassing that his first scene is publicly proposing to a girl who doesn't even like him and nearly causing a political incident. Most transmigrators get dragon bloodlines. This guy gets FAMILY SHAME. Fortunately, he also inherits the most broken cheat imaginable: a magical library containing every lost spell, cultivation method, and forbidden technique in history. While everyone else thinks he's still the academy's biggest clown, he's secretly speedrunning mage levels, mastering spells in minutes, and turning himself into a magical monster. Meanwhile, his maids are confused because he's suddenly nice, his parents are confused because he's suddenly competent, his teacher is confused because he's suddenly talented, and his enemies are confused because the village idiot somehow became a genius overnight. Then a jealous rival challenges him to a public duel. The rival thinks he's about to beat up the academy's biggest loser. The academy thinks they're about to watch a public humiliation. The betting odds are 15-to-1 against him. And our protagonist is sitting there learning ancient forbidden magic like he's cramming for tomorrow's math test. Sometimes the most dangerous thing in a fantasy world isn't a legendary hero. It's a former office worker with unlimited study materials and unresolved workplace frustration.