Sasha, a duke’s daughter who lives by logic and reason, is engaged to the crown prince Alexei, famed as the “Heroic Sword Saint”.
However, behind that title hides a muscle-obsessed, sword-loving, muscle-brained prince.

To protect Alexei’s public image, Sasha works hard in secret, fulfilling her duties as his fiancée. But one day, her stepsister Nastya, who possesses the power of “prophetic dreams”—appears, and everything changes drastically. Before she knows it, Sasha is being branded a “villainess”.

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

Feeling responsible, Sasha decides to break off their engagement and let Nastya, the academy’s saint, take her place.
However, for some reason, Alexei stubbornly refuses to accept it…