Lovers Lina Schneider and Rika Watanabe find themselves separated as their country splits in two. Upon learning that Rika might be suffering under tyranny, Lina sacrifices her humanity to save her, only to learn that Rika has been transformed into the ultimate enemy of her people. Now filled with hatred and confusion about one another, they struggle to work together as they are hunted by not only the military but dangerous monsters and unstoppable mutants for reasons unknown!