Fire Emblem: Seima no Kouseki

Long ago, the Demon King was sealed away within the five Sacred Stones, and the continent of Magvell has since enjoyed a long period of peace. However, that peace was shattered in an instant. The Grado Empire, honored as the most powerful of all the nations guarding the Sacred Stones, began to invade the other lands of the continent. Grado had always maintained friendly relations with the surrounding countries, so why invade? The kingdom of Renais falls without the answer to this question. Because those still in Renais have lost contact with Prince Ephraim and the front line, Princess Eirika is entrusted with reviving her country, and flees on a journey to their ally, the Kingdom of Frelia...