The fiancée of Sasha, a duke's daughter who strictly adheres to rationalism, is Crown Prince Alexei, famed as a 'Hero Sword Saint.' ...However, his true nature was clearly that of a 'muscle-headed Crown Prince,' completely devoted to muscles and swords. To prevent Alexei's image from crumbling, Sasha secretly struggled as the Crown Princess, but one day, her stepsister Nastya, who possesses the power of 'precognitive dreams,' appeared, and the situation rapidly worsened. Before she knew it, Sasha was being branded a 'villainess'—?! 'At this rate, His Highness's reputation will plummet because of me...!' Feeling responsible, Sasha proposed breaking off their engagement and tried to put Nastya, the academy's saintess, in her place, but for some reason, Alexei vehemently refused her!? This is a challenging, star-crossed love story between a serious young lady, awkward in love, and a muscle-brained Crown Prince who is completely oblivious to a woman's heart.