Colette of the Ruined Kingdom: A Bizarre Princess Tale

"Proof of Maidenhood" - ... A mysterious item in the home of queen-in-waiting Colette. - When she loses her virginity, it will disappear. - That item is proof of her intact hymen, and her right to the throne. - To become queen, Colette needs that proof! - To keep that proof, she needs to keep her virginity!​