Konyakusha ni Sobahi to shite Riyousareru Kurai Nara Majutsushi-sama no Houshou to narimasu

Amelia has been training hard to fit the status that comes with being the crown princess. However, she is told by her fianc, the crown prince, that he has met the woman of his dreams. He expresses his desire to make his fated person the crown princess and for Amelia to be the second wife instead. To avoid being taken advantage of, she decides to ask the magician Loire, who has saved her country from a crisis and became the country's hero, to marry her as his reward. When she asks him directly, he says, "Do your best to seduce me," and thus negotiations are made! She begins to go to Loire to establish loving contractual marriage, but...? A handsome love fantasy between a sorcerer and a serious young lady.