Sylfie and a Dragon

Long time ago in a different world.
The invasion of orcs to the human nation began, looting and slaughter occurred in a lot of places. There is one girl who confronts such an act.
Her name is Sylfie, an elf brought up by humans.

Today, she saved a family that was attacked by orcs.
She decided to help people because it shouldn't repeat her miserable past that her parents were killed by orc.
Her only friend is a dragon who grew up together. He was nearly killed by orc in baby days.

Sylfie and a dragon stepped into the orc's castle where a lot of people are enslaved.
Succeeded in their rescue and start countering the orc army.
Orcs? or Humans?
Either one of the tribe would be able to survive.