An Angel's End (Klance Seraph Of The End AU)

Four children grow up in an orphanage, all for different reasons, but all of them become family. Matthew and Katie Holt are two inseparable siblings who had been abandoned. Lance McClain was a young boy who'd lost his family in a car accident.
But Keith Kogane? He was a traitor.

Keith leaves the orphanage behind. He has run from his problems his whole life, why should he stop now?

Keith was the one who pulled Lance from that car. Even though Keith saved his life, Lance doesn't believe that Keith is human. No human would leave their friends behind like that.

Keith and Lance get normal jobs, at the same store no less. They avoid eachother at all costs, seemingly sharing a mutual hatred.

Yet, after trumpets of the apocalypse proclaim the downfall of humanity, a race of beasts rice from the shadows: the Galra. Anyone under eighteen is taken captive and used as livestock to fill their bloodthirst.
All they need for complete world domination is the Seraph Of The End.

And Lance knows exactly who he is.

(AU inspired by a show called Seraph Of The End, please watch that before reading, it will make a lot more sense. )