In ancient times demons ran rampant, killing everything in sight. Until humans sealed them away. One century later they developed the ability to summon and control them in weaker forms. These people are known as "Summoners". Generations later, summoners learned how to manipulate the demonic elements of the demons; this caused the world to be split into four factions, each with their own element. The fire clan, water clan, wind clan, and earth clan. We now follow the story of a young boy named Jinsei Ito from the wind clan, and a princess Aiko Murasakino, from the fire clan. They've been accepted into the infamous Summoner Academy, where summoners from every clan attend and learn the ways of the summoners.
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.