Growing up confined by her weak heart, Suzune Miyama harbors a fervent desire to shine as an idol despite her prolonged illness. Her chance materializes through the prestigious Selection Project, a grueling competition synonymous with the rise of the renowned idol Akari Amasawa. Nervously stepping into the preliminary round, Suzune captivates the audience with her melodic voice, only to falter mid-performance due to overwhelming anxiety. Although her setback costs her victory, a surprising twist emerges as her competitor, Seira Kurusu, gracefully bows out, convinced of Suzune's superior talent. Touched by Seira's gesture, Suzune pledges a future reunion as top idols, bracing herself for the arduous path ahead.