In the distant future, mankind is enjoying a new age of piece; a second enlightenment that has all but created the perfect paradise. However, things changed dramatically when that Hardians attacked; these strange creatures from another galaxy have the ability to multiply, and their overwhelming numbers soon prove to be too much for mankind. In a last ditch effort to defend themselves, an organization known as N.I.D.F. is formed. This elite group is responsible for fighting off the Hardians, as well as to investigate their origin. Aiba Shu and Rurika Yuno are members of that organization, and they each plan to do their part to save the world.