The Devil's Downfall

In one world, there is peace created by the angels, but on another, there are wars created by the demons. Sixteen years ago, two rulers Gina, ruler of the angels, and Josh, ruler of the demons met and fell in love with each other, illegally. After the two rulers are killed protecting their young daughter Charlotte and her brother by a mysterious murderer,  war starts between the two worlds trying to find out who that mysteriously person was. Orphaned with only her brother as company, Charlotte grew up in hiding. 
16-year-old Charlotte has been on the run. When she meets a mysterious boy with secrets of his own, Charlotte must learn to harness her new powers and finally choose a side, and it will influence the outcome of both worlds.