The franchise centers on "Starlight" — the song and dance revue troupe loved throughout the world. Karen and Hikari make a promise with each other when they're young that one day they'll stand on that stage together. Time passes, and now the girls are 16 years old. Karen is very enthusiastic about the lessons she takes every day, holding her promise close to her heart. Hikari has transferred schools and is now away from Karen. But the cogs of fate turn, and the two are destined to meet again. The girls and other "Stage Girls" will compete in a mysterious audition process to gain acceptance into the revue.