Just what it says on the tin, but with a twist. It's the modern world as we know it. Computers, cars, everything as we know it. A man and a woman are in a relationship yet feeling that there's something more going on or that they're missing something. In reality, they're the reincarnation of a prince and princess from a low fantasy kingdom.
Think Dragon Age as the setting. He's a warrior-prince fighting on the front lines against the unholy hordes, she's a mage leading her people through the horrors of war. They share a love that spans lifetimes and defies Death itself.
I see this game as jumping back and forth in setting, some time in the modern world and some time in the past.