I'm the Fifth Son of a Count, but Married in and Became a Duke: Using Past-Life Knowledge to Rebuild the Domain and Be Happy with My Wife and Retainers

Ein, who was reincarnated as the fifth son of a count, is set to become a duke through marriage. However, his territory is in tatters due to the ravages of war, and his bride-to-be, Leila, won’t even speak to him. Using knowledge from his past life and his masterful negotiation skills, Ein gradually restores the territory and begins to open Leila’s heart. Thus begins Ein’s style of territorial reform as he navigates a chaotic world with kindness and intelligence!