Noble Reincarnation: Born Blessed, So I’ll Obtain Ultimate Power

Kizoku Tensei: Megumareta Umare kara Saikyou no Chikara o Eru
貴族転生 ~恵まれた生まれから最強の力を得る~

Source

Noble Reincarnation: Born Blessed, So I’ll Obtain Ultimate Power
Kizoku Tensei: Megumareta Umare kara Saikyou no Chikara o Eru· 貴族転生 ~恵まれた生まれから最強の力を得る~
novel

Born as the thirteenth prince, Noah was originally in a position removed from the imperial succession, so he freely passed his time in the fief granted to him. However, the Crown Prince died before the Emperor. The imperial succession would be fairly contested among the remaining princes. Noah, being the strongest despite living freely, overwhelmed the other princes and eventually became the Emperor with the most power in the world. (Source: Shousetsuka ni Narou, translated)

Side Story

Noble Reincarnation: Side Story - 14-Year-Old Noah's Overpowered Journey
Kizoku Tensei: Gaiden—14-sai Noa no Musou Ryokou· 貴族転生 ~外伝 14歳ノアの無双旅行~
manga

Noah’s honeymoon journey was taken one year before entering his fief in Almeria! At 14 years old, Noah (who will later become Emperor of the Mieres Kingdom) realizes he has a problem: as someone raised in nobility, he lacks understanding of commoner sensibilities and everyday life. Before taking up his position as lord of Almeria at age 15, he decides this gap in knowledge must be addressed. To gain firsthand experience and deepen his understanding of the common people he will govern, Noah embarks on an incognito tour of the empire together with Audrey of the Thirteenth Imperial Household (his wife-to-be). What was supposed to be a peaceful honeymoon trip quickly turns eventful. Even on vacation, Noah’s “musou” (unrivaled dominance) doesn’t stop! Armed with his cheat skills from reincarnation and overflowing intelligence, he encounters various problems throughout the journey and resolves them all with overwhelming competence, turning his educational trip into a “world-fixing overpowered adventure.