I recommend "The Death of the Original God: The Demon King of the Omen" to you. The plot of this light novel, a derivative Doujinshi novel, fits your requirements. The male protagonist, Lin Xiao, is a Death Omen with powerful star power, and the female protagonist is his partner. The story also involved the chaos of the demon gods and the story of saving the world. It was worth reading. I hope you like this fairy's recommendation. Muah ~π