VRMMO wo Kane no Chikara de Musou Suru

Ichiro Ishibuki, the heir to the Tsuwabuki Concern, is incredibly wealthy. When his cousin, Asuha Ishibuki, asks him to help her find someone in the game, he descends upon the world of the next-generation VRMMO, "Narrow Fantasy Online." However, Ichiro is not satisfied until he reaches the top in everything, so he uses his talent and wealth to become unrivaled in the game world!

(Source: Firecross, translated)