Usagi, a high-class escort for hire, is introduced to the bored and egotistical Prince Endymion at a dinner party her soon-to-be "ex" is hosting. Her charms, class, and sexual appeal intrigue Endymion, and the two come to a mutual "business agreement." In return for money and other expensive gifts, Usagi provides intellectual, stimulating entertainment and physical satisfaction for the Prince. Through the course of her "employment," Endymion learns why and how she became "an enchanting creature with the ability to never fall in love."