A Gender-bender manga. Deciding who's the girl and who's man by fighting. https://mangadex.org/manga/24097/the-balls-of-the-elves Description: The demon king having cursed the human race by removing their ability to produce female children so that they would go extinct has had his plan foiled by the elves who made men breedable by giving them eggs(balls) ♂ which would make them become women when taken away from them. Spoiler: Ball
... for some reason I believed that the title was referring to noble parties and dances. I should have remembered that I was on NUF and there was no way it would be that pleasant.
....well this is another level of that did you assume my gender joke The internet never changes with its crazy ideas.