The Legend of FireBoy and WaterGirl

It's the year 20Xx. Much before kings and queens ruled their kingdomes, but at the time elements were a myth to the normal people.
Now, as someone may be asking, an element is a person with strange powers, such as Fire, Steel, Rock, and Wind.
And water.
That is exactly what Emma is. A myth. A water element who is to stay at home with her mother, out on in their little home. They hide when ever the king, King Steel, comes by, which happens to be a lot, because their family is very close to the royality.
The reason why they hide, is from the myth that Water shall rise and take control of the world, defeating the Steel as he will die.
Water is to rule.
Fire shall help.
Wind is to lead.
Rock shall protect.
And Steel is to die.
Now Emma is to travle with with Matt, the fire element with no sights on going backward, as they head to the Forest Temple, then Light, then Ice, and lastly Crystal