Tensei Kenja no Isekai Raifu ~Daini no Shokugyo wo Ete, Sekai Saikyou ni Narimashita~ - Chapter 97 - I Made Them Underestimate Me

The daughter of a duke, the stuttering Maximilian, married a knight of lowly status at her father’s coercion.

Xiao Yu, who was a student from modern Earth, accidentally transports to another world and becomes the lord of a territory. Facing an unfavorable situation, he vows to take back his family business, build his new territory, kill all of those who covet his wealth, and dominate the world!

- Description from Novelupdates

The mastermind leads and controls everything from behind the scenes.“Buy up all the food supplies entering Milan. Let’s starve them to death.”Cutting off the enemy army’s logistics is fundamental.“Give some money to that family and have them betray properly.”I scatter the enemy even before the war begins.I am the Black Merchant in Another World.

To be exact, the female lead is an “older sister” type, amid many beauties and handsome guys, she's no white lotus.Also, it's said that the name of this book is the same as a brand of sheep's milk powder.