Key to the Heart (NaLu Fairy Tail Fanfic) (SOON)

After 2 years of his lover's death, Natsu Dragneel, The Prince of the Dragon Kingdom seeks revenge for his lover. Though he heard rumors on how to ressurect a human being, he set an adventure to find out. After a few months of no clue, he met a mysterious girl who has no memory of who she is.

Who is this mysterious girl?
Who is natsu's deceased "lover"?
Read and find out! :3