Hakushaku-ke no Gonan desuga, Mukoiri Shite Koushaku ni Narimashita. Zense Chishiki de Ryouchi o Fukkou Shite Yome ya Kashin to Shiawase ni NarimasuNew伯爵家の五男ですが、婿入りして公爵になりました。 前世知識で領地を復興して嫁や家臣と幸せになります; 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, wont even speak to him. Using knowledge from his past life and his masterful negotiation skills, Ein gradually restores the territory and begins to open Leilas heart. Thus begins Eins style of territorial reform as he navigates a chaotic world with kindness and intelligence!