Lucy Heartfilia, a 17 years old girl and a Celestial Mage of Fairy Tail, has been a daughter of a demon and a human. One day, a female demon named Shiara went to Fairy Tail to pick up Lucy and trained her to be the next Demon Princess or atlist protect herself. She was gone for 3 years, and since she ever came back, all she ever gave to her guildmates were trouble. As Demon Princess, she has a mission to accomplish. She needs to kill demons who's doing opposite of everything. She is against all demons NOT under her control, which make it hundreds of them or even thousands! But then, she had one rule that she needs to follow while she's still in the war. SHE CANNOT LOVE SOMEONE, SHE CANNOT FELL INLOVE! But then, she brokes the rule and she fell inlove to Fairy Tail's Salamander, Natsu Dragneel. Will she accomplish her mission as the Demon Princess? Please read!