Two Sisters

Lucy and Leila were close sisters. They would go together where the other went, like they came one piece, and could never be separated.
But everything changed.
Leila was kidnapped and was taken to the one of the territory of Clan Of Dark.
10 years later, 17-year old Lucy discovers that she has the 6 Elemental Powers.
Fire
Water
Wind
Earth
Light
Dark
She is the descendant of the Elemental Powers.
Meanwhile, Leila is fed up with all the torture and vows to kill the leader. Then, the leader walked in by himself.
Leila doesn't misses the chance.
Lucy becomes the Commander of Clan of Light.
Leila becomes the Commander of Clan of Dark.

Will they recognize each other as the same blood, or an nemesis?
Or something else?

Their fantasy ride, full of choices, will lead to the answer they hadn't know about, in the end.