The Invincible Undefeated Divine Sword Master

Licht is the abominable son of a prestigious noble family. The guy, despised as incompetent by those around him, is the one with the "natural talent" to pull out the legendary divine sword! With his invincible talent and undefeated swordsmanship—a guy who boasts infinite strength, he takes on the Royal Academy, where vicious conspiracies are swirling around him!

(Source: Kadokawa, translated)