Kizoku Tensei - Megumareta Umare kara Saikyou no Chikara o Eru

Synopsis:

Born as the Thirteenth Prince, Noah was initially far from the line of succession and lived a carefree life in the fief granted to him. But when the Crown Prince passed away before the Emperor, a fierce struggle for the throne erupted among the remaining princes. Though he had lived freely and without concern, Noah proved to be the strongest among them all. Overpowering his rivals, he ultimately ascended to the throne, becoming the Emperor wielding unmatched power in the world.