S4 has announced that they will star in a production of a drama called "ROCK! Rock Girls", which causes Yume Nijino and the other idols of Four Star Academy to cause an uproar. However, the student officers have set up an audition to select three students among the first years to join the drama. Yume, Laura and Koharu are all motivated to pass the audition and co-star with S4. However, who will be the three people to pass the audition!?
S4の四人がしゅえんをつとめるドラマ『ガリギャル』のせいさくが発表され、虹野ゆめたち四ツ星学園のアイドルはおおさわぎ。しかもせいと役を1年生の中からオーディションでえらぶという。ごうかくすればS4ときょうえんできるとあって、ゆめ、ローラ、小春はやる気まんまん。はたして、3人はオーディションにごうかくできるのか――!?