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――！？
