Chronicles of an Aristocrat Reborn in Another World (Manga), Vol. 2

Cain von Silford--reincarnated aristocrat with immense power and divine protection from mischievous gods--is now ten years old. He's off to the royal capital to make his debut when scores of orcs swarm a carriage holding two young noble girls. He saves them both, and finds himself doubly engaged to be married! And then the god of commerce makes a seemingly impossible demand--one for which his magic is useless, and only his knowledge of Earth can help him achieve!