The story follows Aiden Sato, an intellectually-gifted high school student who discovers a supernatural software in his pendrive that grants its user the ability to kill anyone whose name and face he knows.
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.