It's a bit of both. It's part romance, part adventure. It's told completely from Martin's perspective, though.
My current reason is that Russia reveals that when the U.S.S.R. fell, they secretly put in a shadow government. The dictator steps out, and declares war on all nations with democracy. Kind of out there, I know, but I'm still working on it a bit.
Well, sometimes when Martin's unit goes to evacuate civilians, a battle has already begun. They're often caught in the crossfire. And you have to remember that Martin and Luna have been dreaming of each other for a year, thinking that one another was a figment of his or her imagination. There's at least some affection there. And a personal tragedy for each character will occur to drive Martin to desert.
I'm not offended, and you didn't come across that way, don't worry! I'm aware that this book could have a fairly shallow plot, but I'll try to at least make it interesting.
As for a sequel... I've decided against a full blown series. But I was thinking perhaps having the first book in Martin's perspective, and the second in Luna's; that is, if I decide to have a second book. I could just do a "part one/part two thing in one book, shifting perspectives. Of course, I'm open to ideas and constructive criticism.