With a title like that, there no real need to talk about the plot, is there? It should be enough to tell that the girl that's front and center to the cover page is our protagonist who starts this doujin as a douchebag guy and ends it as a cute girl.
What happens when you genderbend close friends with a magic smartphone app? A lot of sexy shenanigans! And it's all fun and games until you run out of premium currency and the local whale genderbends you...