"Claire Radish! A failure like you, who can't even use a single spell properly, is unworthy of being my fiancée!" Claire, the daughter of a Margrave, is the fiancée of the selfish and arrogant Second Prince, Oliver. Following the Queen's orders, Claire has spent many years as his fiancée, tirelessly cleaning up his messes. However, Oliver becomes infatuated with the cunningly cute Baron's daughter, Carol, and declares the annulment of his engagement to Claire at the Royal Academy's appreciation party...! As one unexpected event follows another, the one who comes to Claire's rescue is none other than the First Prince, Gilbert, who bears the nickname "the Lustful Prince." Claire had been wary of him due to the nasty rumors, but he turned out to be completely different from what she expected…?