2312 A.D. Four years have passed since the final battle between Celestial Being and the UN Forces. Humanity, after having established the Earth Sphere Federation, forms an independent security force, A-Laws, separate from the formal Federation army to further unify nations and the will of mankind. But the reality is the inhumane oppression of anti-government powers, doctrines, and ideologies in the name of unity. Setsuna F. Seiei, after surviving the battle four years ago, has decided to once again fight with his Gundam.