The Seven Sisters

'"Collectively, we're know as the Elemental Sisters. As the last Elemental Sister with your power traveled to Heaven for the last time, they chose you to inherit their power. You each have one Elemental power that keeps one part of the world running." Green-dress says.
"What?" I say. "Listen, this day has been crazy, but aren't there traditionally only four elements?"
"Well, on Earth, they believed that for a long time. But it takes more than four Elements to create the world. I mean, seriously!" She answers.
"So what are they?" Asks a girl in red, who for some reason isn't wearing shoes.
"Nature, Animal, Water, Heat, Life, and Death. It's traditional that we call each other our Element names, I'm Nature," Green-dress answers. Or Nature, now. Whatever.'

What will these six girls discover about friends, family, and power? A story of family, powers, and bloodshed, these six girls must fight an evil never before conquered- and manage to keep their world a secret. How can they manage to do it, when if even one of them dies, it affects the whole world?