The girls of 765 Production Studio are buzzing with excitement as they gear up for the International Music Festival on Vacation Island. Amidst the allure of an amusement park and a luxurious resort, the festival guarantees days filled with joy and adventure. However, their thrill is tempered when their producer reveals that only one unit can partake. Split into three groups in various scenarios, the girls eagerly vie for the coveted opportunity to perform at the festival. As they embark on a three-day vacation leading up to the grand concert, each group immerses themselves in the festival's offerings, from their arrival on the island to the electrifying main event. Anticipation runs high as they embrace the unique experiences tailored to each group, all eagerly anticipating their moment in the spotlight.