The summer fest is here at last. All of the project members are nervous about performing on the grand stage, but their rehearsals go smoothly thanks to Minami's leadership. But then Minami collapses from accumulated stress. Ranko does an emergency fill in for Minami with Love Laika and somehow, the rest of the Cinderella Project's performances go off without a hitch... until a sudden downpour causes the rest of the concert to be canceled!

The project that Producer proposes to Executive Director Mishiro is called "Cinderella's Ball: Power of Smile." It's meant to be a complex event that will showcase the idols' individual strengths. Though Mishiro's proposal runs completely counter to this idea, she gives Producer permission to run with it. Producer and the idols will be able to prevent the gutting of their division if they show results within a certain time frame.

The Cinderella Project idols are happy about this reprieve, but idols in other departments, particularly those whose strong suit is with variety shows, find themselves facing changes due to Mishiro's course of action. And one of them is the eccentric Nana Abe, who claims to be from the planet Usamin! Cat character idol Miku worries about getting the ax, while Riina worries about Miku...

The Cinderella's Ball finally begins, with the Cinderella Project girls encouraged by Producer to smile as they do each of their routines.