Soredemo Sekai wa Utsukushii

Synopsis

Nike, the fourth princess of the Rain Dukedom, has a strange power. She’s capable of controlling the rain. She travels to the Sun Kingdom to marry King Livius I. Even though unwillingly, she’s doing it for her people and her home. Just who is this man, who conquered the world in just three years after climbing the throne? He’s still a boy, younger than her even! A weird tale begins to unfold, as the king takes a liking to her power of controlling the rain. (From [Crunchyroll](/group/d5rrh73/crunchyroll))

Synopsis & details from MangaUpdates