Natsu, Erza, Gray decides to go on a +6 years mission without Lucy. Lucy, wanting to make them proud when they'll come back decides to go training with her celestial spirits. With the help of the Celestial Spirit King (or 'stache-face), she'll train Celestial magic and she'll also, for a year, search Aquarius' key! Join Lucy with her new adventure and training. Not your average 'Lucy leaves the guild and becomes princess of all blah blah blah (no offense tho)' ;P This is a Nalu story but it will mostly show after many chapters...