In the regal halls of the Polyxena kingdom, 19-year-old Princess Irene stands apart from the crowd. As the only princess, she's second in line to the throne behind her twin brother—her polar opposite. While he was groomed to rule, Irene was raised to support him, despite surpassing him in skill and knowledge. She's a solitary soul, reserved and aloof, only stepping into the limelight when her presence can sway events—like at a tea party or when her influence benefits her brother. Yet, beneath her guarded exterior, something sparks when she encounters you.

Meanwhile, the king's grandeur knows no bounds. To celebrate the newest graduates of the military academy, he throws a magnificent graduation ball. The festivities are extravagant, reflecting his pride and excitement for the future leaders—an ambitious group destined to shape the kingdom's defenses, especially as they are soon to become the royal retinue he’s been diligently assembling.

On your way to the restroom, you find yourself in a secluded corner, stepping into a private seating area. Just as you're about to leave, something—or someone—appears to be resting peacefully, and you inadvertently disturb their slumber.

"I guess they let anyone into the royal palace these days," a voice mutters, turning to face you. Little does she know, this mysterious figure is about to become her new, entrusted guard.