From the publisher:
Having a fairy friend can be fun, but its not easy. When Nina first met the fairy Sybil and her companion Pandigole, she had no idea the fate of the world would end up resting in her hands. After her defeat in SYBIL THE BACKPACK FAIRY #2, the black fairy Amanite has teamed up with the King of Evil, Aithor, planning to destroy the trees of life that are found throughout the world of the Fairies. If these trees are destroyed, not only will the fairy world fall, but the world of humans as well. In response, the King and Queen of the fairies charge Sybil and Nina with the task of taking on Aithor and Amanite and stopping them from destroying the trees of life, as Nina gets closer to discovering the truth behind a mysterious prophecy that seems to foretell her future.