Minarai Fuufu: Elite Onzoushi ni Metoraremashita

Minarai Fuufu: Elite Onzoushi ni Metoraremashita summary:

Always one to do her best for her family's business, Kisa has become a weary woman with little time left in her life for herself, let alone any traces of romance.
"I'd like to take you as my bride."
An unexpected proposal comes out of the blue when Amane, the young president and member of an old noble family, visits her family for business…!
"Why me?" Even when she asks him the reason, Amane’s vague answer of "just based on my intuition," bewilders her. Despite her uncertainty, her heart is slowly swayed by his honesty and the pair end up living together with plans for marriage. But living together with Amane, whose cool appearance contrasts so greatly with his sweet approaches, seems to bring forth a tempest—?!
(Synopsis: Gourmet Scans)