Guardian of the Moon

Solana Song is the nicest girl North has ever seen. She is also an orphan. Jack Frost is given the ability to be a human again only to protect Solana. The reason: Because she is the next guardian, and the first half-spirit, half-human to be a guardian. (This summary sucks, but I hope you like the story. Semi crossover with Sailor Moon, but not much-no swearing in story)