David Johansson, the Creative Director of GTArcade mentioned about the plot of the new game and the Great Demon King.
The game has a different name to differentiate it from the Browser one and to be sure that people that play on mobiles understand that is a new, different game.
You can categorize the Fire Raiders as some Angels and Heroes that decided to save the world from the demon invasion. The Fire Raiders are present in a world that used to live in peace for thousands of years.
Angels do not usually help humans but when the Great Demon King decided to invade the world and became the most feared demon in the world, the Angels decided as well to assist the heroes that want to gloriously fight the forces of evil.
The Fire Raiders were united by this purpose to remove all the evil from the world and cleanse it.
The Great Demon King story is really interesting, he was a human once and he was in love with an Angel. She was killed by the Gods and he went to seek revenge in a different realm full of demons and now he returned.
The Great Demon King is not against everyone even against his own kind the human race.
His soul was corrupted and he can’t become the same again. His anger is making him something everyone fears.
The story will expand as the game progresses but the developers seem to be more focused on the PvP content at the moment.
Also you can create your own story lines and do some role play and inspire the developers to add your stories in the game.
League of Angels Journal 