At Yotsuboshi Academy, an idol school where the top four stars are known as the S4 and perform as active idols, Yume Nijino and her fellow first-year students dedicate themselves to earning a place among the elite group. The film follows Yume and her friends—including the spirited Rola Sakuraba—as they train, compete, and support one another on their paths toward becoming the brightest stars they can be. The title, Progress of the Stars, reflects the core theme of continuous growth: the characters confront new challenges, deepen their bonds, and push beyond their limits in pursuit of their dreams. As a tenth-anniversary celebration of the series, the story revisits the aspirations that first drove Yume and her companions, carrying forward a message that dreams are not simply to be dreamed but to be turned into reality, and that every step forward is a step toward a brighter future.