The Cyras Empire, an empire in which everything including the citizens run on solar energy, is invaded by the Aniera Sovereignty, a nation of people who thrive in freezing environments. In an attempt to overthrow the kingdom, they turn the Cyras Empire into an eternal winter. Led by their general, Nix, the Aniera army full of monsters called the Isarri continue their extermination and won't stop until the Cyrasi are all gone. Nuria and Oriza, the crown prince, are young survivors that managed to live through the initial attack due to how far they were from the epicenter. Now, they are attempting to not only survive but take down the Aniera Sovereignty and take back their empire no matter how hopeless it seems.