That is the story of a world called Ivalice.

The strong military kingdom known as the Arcadia Empire
That rules the Valentia Continent,
And the Rosalia Empire that rules the Ordalia Continent
Have been continuously at war for long years.

In the midst of it, Arcadia Empire invaded the small kingdom of Dalmasca,
Positioned in the hallway between the two continents and thus is geopolitically important.

Under the invasion of the Arcadia Empire, the Dalmasca Kingdom accepted defeat.
But Ashe, the rightful heir to the trone of Dalmasca,
Joined the resistance army movements to fight against the empire.

The enemy's chase and attack of this girl with the liberation of her mother nation in heart is severe,
But, she can not be defeated.
At this moment, she meets the young man Vaan.
With this meeting, begins the change in Ashe's heart.

And thus...

The meeting of these two people will greatly change the story of this world.