This I Promise

When Rose accidentally frees Seth from a room on the third floor of her house, and he starts throwing what appears to be fire at her, she is thrust into a world of magic and wonder. However, she learns that her whole lifewho her parents are and who she is, or rather, what she ishas been a lie. Rose discovers that she is a Fire Populous, one of four kinds of Populous. The other three are Water, Earth and Air Populous, and they all live on different islands. The Populous stay on their islands and never leave for fear of being killed by the Demons. When Rose is later betrayed by her parents and saved by Seth, she begins to question everything. Who are her friends? Who are her enemies? Is there anyone she can trust? Everything is already such a mess, but when Rose is told of the dark magic being used to gain control over all of the Populous and create a massive war between them, everything becomes so much worse. Now Rose must discover the people behind this, what their end game is and how to stop them before the Populous wipe each other out, one by one.