Sasha, a duke’s daughter who lives by strict rationalism, is engaged to Alexei, the crown prince celebrated as the “Heroic Sword Saint.”
…However, on the inside, he’s nothing more than a muscle-headed crown prince who has put everything into training his body and swordsmanship.

To protect Alexei’s public image, Sasha has been secretly working hard as his fiancée. But one day, her stepsister Nastya, who possesses the power of “prophetic dreams,” suddenly appears, and everything takes a sharp turn.

Before Sasha realizes it, she’s being called a “villainess”—?!

“At this rate, His Highness’s reputation will plummet because of me…!”

Feeling responsible, Sasha proposes breaking off the engagement and suggests that Nastya, the academy’s saint, take her place.
But for some reason, Alexei refuses with all his strength—!?

A love story full of misunderstandings between a serious, awkward young lady and a muscle-brained crown prince who is completely clueless about women’s hearts.