Minarai Fuufu: Elite Onzoushi ni Metoraremashita

Kisa, who works hard at the family business, is a country girl that has never once been in love. One day, Amane, a young CEO who is the descendant of an old noble family, visits her family home on business and suddenly proposes to her: "I'd like to marry you." When Kisa asks why, he confuses her even more by simply stating, "I can just feel it." Eventually, his straightforward words win over her heart, and she agrees to live together with the promise of marriage. Despite his cool and collected exterior, his sweet and gentle actions bring them closer, but their new life together may encounter more trouble than expected...?!

(Source: Starts Shuppan, translated)