story. now.
So basically the angel acted Unholy in Heaven, therefore, she was banished by God to the space in between Heaven and hell. This was to see if she will change her behavior. But instead she is only interested in taking revenge and travels out of Limbo. There she meets her Equal, the devil boss, who is the protector of the entrance into Heaven. They fight and the Angel defeats the Devil. She travels to the throne of God and Defeats him too, absorbing a bit of his power and becoming the new Ruler of Heaven.
Hope that explanation was mildly interesting!