Sent to another world similar to her original she lives as Avalon Kanze a girl with rocky blood relations. Living in a country that didn't exist in the other world Niahurii, she is forced by her blood relations to join the military as a man. Unwilling, but the deal they strike is that only reason for her doing so.
People with abilities powers of which normal humans can not use. Monster's, freaks, people have called those with these abilities with such names, but there is one name that became attached to them eventually, Esper. The strongest of all abilities is physic, and ability the nearly makes anything possible for a skilled user.
Avalon's lazy days in the military begin to change when that man appeared. Plans begin to change, new conflicts and allies begin to arrive. Can she keep her identity a secret or will they learn the truth? But most of all can she keep her darkest secret, the truth about her 'disease' and condition from everyone.
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.