Dante

Once upon a time, angels and demons lived separately: the angels in the boundless Paradise, the demons in the depths of Hell. There were conflicts between them, but nothing ever came to actual war.
However, over time, the angels' numbers grew. Heaven became overcrowded, and the higher angels decided to expand their domain. Their sights fell on Hell. Under the pretext of "purification," they invaded the demonic world and began a merciless war.
The demons resisted, but the angelic armies were too numerous. City after city, fortress after fortress, Hell fell. Most of the demons were destroyed, and the survivors hid among the ruins.
Years later, only two demons remained of an entire race. They were the last witnesses to the destruction of their world. Now they must survive among the ashes of the fallen Hell, hide from the angels, and decide what is more important to them: revenge for the destroyed race or trying to find a way to bring the demons back to life.