Shattered World.

Two twins face off against a seemingly unbeatable little girl and the world comes to an end. Or does it? Our main character Xera wakes up in his bed after dying but chalks it up a bad dream. It's nothing new for him, after all he's been having dreams like that since he was little. Either way, be doesn't have time to dwell on it because he and his twin brother Asriel start their first day at the Worldwide alliance Academy (WWAA).