I thought it was a sweet dream.

Celestia heard that Calvin, the First Prince whom she had previously served as a tutor, had been stripped of his title as heir. Because he had committed the outrageous act of unilaterally breaking his engagement with the marquis's daughter, who was completely blameless, in front of the public, his younger brother, the Second Prince, would inherit the throne, and the former fiancée would marry the Second Prince instead. Though he had been a mischievous child in the past, Calvin was actually a diligent person who worked harder than most, and by the time he parted ways with Celestia, he had become an admirable prince in everyone's eyes. Celestia found it unbelievable that he would do such a thing without reason. It seemed that behind this broken engagement, there were hidden circumstances...