Pirania

Anastasia, a duke's daughter of commoner origin, is married off to the young head of an earl's house as a sacrificial lamb to ease her family's financial troubles. On her disastrous wedding night, her new husband Eugene delivers a line devoid of originality: "I have no intention of loving you." Expecting this cold treatment and never hoping for a warm welcome, Anastasia does not despair. Instead, she drops her facade of a timid, obedient lady, curtsies gracefully, and smiles. "Let's become business partners, my husband."Original Web Novel: Kakuyomu, Syosetu

A happy love comedy full of "firsts" that starts with a one-night stand! Misaki Mano is almost 29 years old, and her age is equal to the number of boyfriends she has had. As a result of her virginity, she ends up spending a night with Kutsuna, the most handsome guy in the company, in a drunken rage without remembering it at all!