"A girl who goes by the name Fawn mainly exists in the current era mainly taking care of her sister for the last time before she reaches her end-stage as she was her only will to live. However, her sister seems to refuse anything she does that'll help her stay alive. Hopeless, Fawn slowly gave up on her life as she watched her sister pass away in a deep hatred between her and her sister. They have never gotten along and only talked whenever it's needed. But one day, the girl out of nowhere jumps into a portal of time and accidentally ends up in a place where no such hint of modern technology but mostly ancient and old age dimension, filled with nature almost everywhere. As the woman was exploring out of curiosity, Fawn comes across a man in brown with a black mask that blocked the attack caused by the mutants who had charged towards Fawn. The man requests a favor from Fawn after he had saved her life. Fawn had no clue what to give to him. Then, the man offers her to be his apprentice in magic in exchange for bringing her back into her original world. However, things to end up in a different way and not how it was planned."
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.