Corrin, a royal adopted into the militaristic kingdom of Nohr, discovers their true origins when a military operation goes awry and Hoshidan forces reveal they are the long-lost child of that peaceful realm's royal line. Raised in isolation by the tyrannical King Garon, Corrin possesses an extraordinary gift—the ability to shapeshift into a dragon—and wields a sword of legendary power, making them a force of immense strategic value. Faced with the revelation of their blood family and the mounting aggression of their adoptive homeland, Corrin must choose which kingdom deserves their loyalty, ultimately deciding to stand alongside Hoshido against Nohr's advancing armies. The decision forces Corrin to take up arms against those who raised them, setting the stage for a devastating conflict between familial bonds and the call of one's true heritage.