Mai is a teenage Faunice, which is a race of people with the ability to turn into animals. She lives in a time where humans, Faunices, and Mages -which are humans with exceptional magic ability- are on the verge of war, when they should be friendly allies. Having gone through way too many hardships for any normal person (being betrayed, attacked, hunted, tortured, and more) she now learns that she must help fight to protect and unite the people of the three factions to stand up against the Joviens, who are terrorizing everyone in an attempt to take over. Fortunately, however, she doesn't have to do it alone. Surrounded by friends and family, and maybe someone more, she goes on a journey to discover her true self to destroy the Jovien menace.
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.