Are there any fantasy novels or anime recommendations about the main character's sex change?

😋I recommend you the Enemy Ghost King. This novel was a fantasy romance novel. The protagonist suddenly changed from a handsome man to a shy little boy, and the female protagonist also had a special ability that could not be determined by gender. The gender switch between the male and female leads to a series of interesting troubles. The plot is light and humorous, and might make you laugh out loud! I hope you will like my recommendation.😙