(Manga) The World is Still Beautiful (それでも世界は美しい; Sore demo sekai wa utsukushii)
From Wikipedia: "Nike, the fourth princess of the Rain Dukedom, possesses the power to call forth the rain. She travels to the Sun Kingdom to marry Sun King Livius for the sake of her country, despite her own reluctance. She soon discovers that the King, who conquered the world in only three years after his ascendance to the throne, is still a child. Furthermore, for trivial reasons, he has demanded that Nike call forth the rain, and when she refuses, he has her thrown in jail. The story follows the two who, while at first are a married couple only in name, gradually begin to establish an emotional bond with one another."
Crunchyroll has the anime adaptation for this, but it only covers part of the series. (I'd still recommend checking it out, though.) It's a really cute story and would do well for expanding the female-demographic series. According to wikipedia it's ongoing and there's currently 21 volumes out.
The day JNC licenses a long shoujo manga will be an amazing day and a shocking day if it's a Hakusensha title like this one. Not to say it's impossible as JNC has taken baby steps into the genre and other publishers have finally broken the mold that says all Shogakukan, Hakusensha and Shueisha manga titles must go to Viz or not at all, but there still hasn't been too many yet. I've held off on requesting my laundry list of shoujo titles here as many fall under that umbrella of Japanese publishers and because it still seems like a pipe-dream to me, but here's an upvote regardless as I always want to see more love for shoujo.