Aoi and Aimi are in search of the same object : the Final Blade.
They go to a high school called Kimaya Highschool. Something about them makes them different from other kids.....but what is it?
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.