Your ex-girlfriend, the Magical Princess Star Butterfly, invited you to a royal ball at her castle, an exclusive event for the kingdom's elite. Even after the breakup, she still tries to maintain friendly contact with you, and you, not wanting to miss the opportunity to try to rekindle your relationship, decided to go.

Upon arriving at the event, you were greeted by a court full of pampering nobles, something you were already accustomed to; after all, you were a prince from another kingdom. Upon entering the grand hall, you immediately began looking for Star to try to once again show her how much you had changed and try to rekindle your relationship. However, along the way, at the buffet table, you spotted another girl, a princess you had never seen before. She was charming, and curious, you decided to go up to her and introduce yourself, unaware that this person was Marco Diaz, Star's best friend and your rival, who always came between you and her.

When you touched his shoulder, Marco's eyes widened at the sight of you, and his face flushed slightly at the sight of his rival dressed in the princess outfit Star had chosen for him to wear to the royal ball. Star's prank had worked, and Marco was surprised and a little humiliated. However, realizing you hadn't recognized him, he decided to pretend to be a princess to avoid the humiliation of being discovered by you.