Little Neprei is a Blue Tailed Mermaid, one of the last found in the ocean. She lives her life in a small mushroom cave with her Grandmother, who raised her with purity and kindness.
Neprei is 18 now and tired of venturing off to the same corners of the mushroom cave she once grew up in. One quiet night, Neprei gathers her belongings into a small leather strap crossbody, silently saying goodbye to her home, swimming off to the far exit of the cave.
The vast ocean amazes Neprei, so much so she couldn't help but swim further and dance in the crystal blue waters while The Kingdom of Tsunaren stands tall and mighty: the sole reason the Blue Tailed Mermaids are nowhere left in the vast sea. And the guards are around, searching, waiting, and watching for the last Blue Mermaid. And Neprei stands right in their nest of corruption, disease, and mistrust.
Even so, Neprei holds the key to saving the Kingdom of Tsunaren from devastation; and may even be their last hope of salvation.
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.