Many centuries ago, the Dragon People and the Star People fought for dominance in the heavens. Each hotly claimed their right in the celestial bodies, and many devastating wars took place because of this feud.
The people of Earthland were terrified every night by the thunderous rumblings that emanated from the skies, and cowered deep within the earth to shield themselves from the wrath of the battles, which occurred almost daily.
Two lovers, however, managed to bring peace to the heavens again by sacrificing themselves to soothe the bloodthirsty warriors. The two lovers were a Dragon Prince and a Star Princess, and they risked all to bring harmony back among their people.
To remember that the Dragon People and Star People should never fight again, the Celestial Queen of that time, Anna, set the two bodies of the Dragon Prince and the Star Princess into the sky as constellations. The Dragon King, Igneel, made a pact with her to never war with each other again.
That was a thousand centuries ago.
However, war threatened the skies again, as a new and terrible man ascended the throne of the Dragon People. His name was Acnologia, and his rule was corrupt and fierce. He was hungry for more territory, and was dissatisfied with his allotted space of kingdom. Acnologia then acted in defiance of the sacred pact.
He sent one of the seven deadly Dragon-bred assassins to kill the beautiful Star Princess of the current era. Her name was Lucy. The assassin's name was Natsu.
Once again, war threatened the skies, and if peace were to be lost, the whole realm, Earthland and the heavens, will never be the same again.