The Mesi

When meteorites fall to earth, nobody thinks anything of it. After all, meteor showers happen all the time. Well what nobody knows is that there are soldiers in each meteor, and they came to earth to fight the final battle, a battle that has been fought for hundreds of years. The only thing is, they need human host to fight in.
Marina Mizu was having a good day. She was on a field trip to the aquarium, no school work, and her birthday was coming up. Then the meteor showers began, and it all changed.
Being used as the host of the princess of the aliens in their battle, was not how she saw her life going. But when Mesi, princess of the Kysisa, a race of warriors who can control the elements, needs to use Marina as a host, it's what happens. After all, if the Kysisa don't win against the Tzila, the the human race would be brought to it's knees.
But add in a shady government organization, an army spread across America, and the fact both Marina and Mesi are only teenagers, and you get one hell of an adventure.