In short (at least kinda) the story i have in my head is about Gabriel, forced by god to live on earth to learn to love humans, as he despises them.  He is only allowed back in heaven, if he learns true love towards a human being. He will struggle through human life, meeting Alexandria and he will fall for her. He falls for her as she is the ying to his yang, they will share the despise, they will slaughter and finally they will attack heaven, as Gabe loves her more than god, trying to make their plan reality, to kill god and make Alexandria the new highest spirit in existence...