The Erebonian Empire almost broke the Kingdom of Liberl ten years ago, cutting to the heart of Capital City before being forced back by a fierce counteroffensive commanded by Cassius Bright. Now, as the invaders close in on the little kingdom's northern boundaries, wanting its magic and advanced technology, Liberl slowly rebuilds with the help of the Bracer's Guild, whose mystical use of "Craft" is as important to the nation's defense as its own army. For Cassius's daughter Estelle Bright, this is all merely ancient history that she and her adoptive brother Joshua learnt as children. But history has a knack of repeating itself, and as they prepare to join the Bracers Guild, dark forces are plotting to kill them.