The Dragon's Master

Sarah's life was normal, before the age of the dragon's rising began.
The fiery creature plans on taking the world one group at a time. First was the Unicorn Riders, then the Demonic's, after that, it was known that the rage of the dragon's had begun and was finally striking in an attempt to take over the world.
Will Sarah be able to defeat the dragon? Or, will she find a way to tame his striking spirit?
Although, she is seen as a nobody, causing everyone to lash out, she's pushed away and finds her own fiery spirit must somehow connect to this raging creature.
Her past is dull, but was it true?
Is this creature's anger because of the lost Dragon Master? Or, is his aim ultimately to take over this world for his own?