The World War II finally came to an end and six years after the horrendous disasters it left behind; the whole world began to flourish again. Caught up in the bloodshed was White Weiβmann, the first son of the Weiβmann family, who mysteriously disappeared after the end of it leaving the family in absolute bewilderment.
His younger sister, Mary Weiβmann, decides to follow his steps in order to find answers about his sudden loss, which lead to the military camp he worked as a Lieutenant before, the Leidhaven military camp. There, Mary is about to start a new life, meeting the difficult lifestyle of the soldiers, how they work and finds her first love while trying to deal with the two biggest obstacles that appear, her own fears and Colonel Edward Breininger, who does not want her welcome in his surroundings.
In the epic conclusion to the Devil's Deal series, Freya has one final chance to discover the full potential of her own power, and to use it to restore balance in the universe - once and for all. After the destruction caused by Roisin, Ferya and Torix come to terms with their losses and mistakes... And prepare for a final battle that will change everything.