Uzuki Shimamura is an ordinary girl who dreams of being an idol, so she goes to a special training school. One day, a producer for 346 Production shows up with the news that she’s one of three girls chosen for the Cinderella Project, even though she didn’t pass the audition the first time around. Uzuki is thrilled, but the project can’t start until the other two members are picked... The producer scouts Rin Shibuya, who he has in mind for the second opening. However, Rin isn’t interested in becoming an idol and turns him down flat...

Uzuki and Rin come to 346 Production for the first time. They meet the final member who won the idol version of a “second chance sweepstakes,” Mio Honda, as well as the 12 other eccentric members, and thus the project can finally start. The first job for the three newcomers is to do a publicity shoot, but their nervousness threatens to derail the whole thing. Somehow, they get through it, and well enough to impress superidol Mika Jougasaki, who suddenly hires the trio to be her backup dancers for an upcoming concert!

Utsuki, Rin and Mio start taking lessons to train to be Mika’s back dancers. It’s a long, hard struggle, but thanks to the encouragement of the other project members, they somehow make it. But the pressure of being on stage for the first time has stressed the trio out so much that even the final rehearsal doesn’t go well. Will they be able to get it together for the actual concert?

Producer fails to chase after Mio when she runs out of the office. This makes Rin and the other project members distrust Producer's attitude and what he means to do on his own. Then Rin leaves the project too, and it looks like the whole thing may fall apart. Producer pays a visit to Uzuki, who had the misfortune of catching a cold at this critical time, but her smile and unflagging dream of becoming an idol strengthens Producer's resolve to bring Mio and Rin back into the fold.

Meanwhile, the other members hear about how Producer became cowardly in the way he interacts with the idols after a past incident...

As summer rolls around, Producer and the idols become closer, while the project moves along nicely. And for Ranko, it's especially nice, as she gets to make her CD debut next. However, there's a major gap between the image Ranko has crafted for herself and the way Producer perceives that image. He makes an effort to understand her, and she does her best to communicate with him, but will they be able to reach a middle ground?

The fall fest held by 346 Production has begun at last. The Cinderella Project idols are each determined in their own way and fired up as they face the concert. Per Producer's decision, New Generations is sitting the concert out, but Mio and Uzuki are on hand as staff to support the others, while Rin performs with Karen and Nao to make their concert debut as Triad Primus.

Meanwhile, Anastasia performs solo for the first time on stage and all the other Cinderella Project idols shine more than ever. On the other hand, it's the first time for the Project Krone idols to be on stage. Their nervousness reaches its peak right as they're about to go on...