My Childhood friend was Imaginary, Wasn't He?

Agather is beginning to realize that her life isn't as normal as it should be for a seventeen year old. For one, her imaginary friends that she made up when she was a child aren't as imaginary as she thought. She's realized recently only she has the power to save the whole Spirit world, Just how she can do that she has no clue. But she isn't alone, and with her friends and Xavier, the far too hot for his own good spirit Prince, she knows, or at the very least, hopes, that she has what it takes to take on the darkness, threatening to swallow everything.