Accomplishments of the Duke's Daughter (Light Novel), Vol. 1

The MC is an extreme Mary Sue who, despite being a mere tax worker from Japan, knows how to make chocolate, start a banking industry, make cosmetics, revolutionize agriculture, blah blah. She and her companions are all good and virtuous and the best of the best (as usual, there's nothing “villainous” here), and everyone who opposes them is stupid and evil. Zero conflict.