The continent of Valentia is home to two sibling gods: Duma, the elder brother for whom only power holds meaning, and Mila, the younger sister who dreams of creating a paradise. After a long and brutal conflict between them, the land is split in two, with Duma lording over the north and Mila tending to the south.
Millennia later, two nations have taken root in their respective regions: Rigel, an empire of gallant but cruel knights, and Zofia, a kingdom of affluent decadence. Each of these two countries follows its own path, but they coexist in delicate harmony.
When this fragile peace is threatened, two heroes rise: Alm, grandson of the knight Mycen and resident of Zofia's quiet Ram Village, and Celica, Alm's childhood friend and priestess of Novis Island. Though they have long been separated, the mysterious mark ​on each of their hands reminds them of their connection. And as the shadows of a chaotic conflict descend across the land, both of these heroes set out with determination in their hearts, each seeking to restore peace in their own way.

This game is a remake of Fire Emblem Gaiden for the Famicom. It expands upon the original with significant story additions. It also offers downloadable content that allows players to overclass their units, promoting beyond the pinnacle of their most advanced available class.