Chou Taikoku no Ikemen Outaishi ni Totsugitakunai!!

The Kingdom of Freisos is a nation so poor it could be called desperately impoverished. Tradition and faith are all that keep the people going. To save her struggling homeland from financial ruin, Princess Lilia Freisos decides to take part in the “Trial Marriage,” a matchmaking event hosted by the mighty and prosperous Kingdom of Grandania. Participants receive a generous preparation fund, and all expenses during the week-long event are covered by Grandania. If a princess fails to be chosen as a bride, she can return home without repaying a single coin. Being confident that no one would ever choose to marry a princess from a poor kingdom, Lilia sees this as the perfect opportunity to earn some money for her country, until Prince Io Grandania himself unexpectedly names her as his partner…?! https://www.cmoa.jp/title/249416/