"Aikatsu Stars!" is an idol-themed anime and manga series that centers on the lives of young girls striving to become top idols at the prestigious Four Stars Academy. The story primarily follows Yume Nijino, a cheerful and determined first-year student who dreams of joining the elite S4, a group of the academy's four most talented idols. Yume's journey begins when she transfers to Four Stars Academy, a school divided into two idol groups: the traditional "Song" division and the performance-focused "Dance" division. Yume joins the Song division, where she meets and befriends other aspiring idols, including Koharu Nanakura, a kind-hearted girl with a passion for singing, and Rola Sakuraba, a confident and stylish performer.

The narrative explores Yume's growth as she faces various challenges, including rigorous training, intense competitions, and rivalries with other students. A key aspect of the story is the Aikatsu system, which allows idols to use special cards to create dazzling stage outfits and performances. Yume's determination and creativity help her stand out, but she must also learn to balance teamwork, friendship, and self-improvement. Her interactions with the S4 members—Lily Shirogane, Elza Forte, Ako Saotome, and Mahiru Kasumi—provide both inspiration and obstacles as she works toward her goal.

The series also delves into the lives of other students, showcasing their unique talents and struggles. Themes of perseverance, camaraderie, and self-discovery are woven throughout the narrative, as the characters navigate the pressures of idol life while pursuing their dreams. The story progresses through various arcs, including school festivals, idol competitions, and personal challenges, culminating in Yume's efforts to prove herself worthy of joining the S4. The blend of music, performance, and character-driven storytelling makes "Aikatsu Stars!" a compelling exploration of the idol industry and the dedication required to succeed in it.