With their latest song flopping hard, the Pop Secret girls fear their career is over. But Baron von Kaos has other plans—triggering the infamous Kutano Plan, a ruthless strategy used on past stars who mysteriously vanished at the peak of their fame. Now, with a final concert looming, the girls must pull off a smash hit or risk facing the Baron's secret scheme. As they scramble to write the perfect song, they uncover a chilling truth about what happens to performers who fail under the Baron’s rule. Will they rise to the occasion, or will this be their final curtain call?