Descent of the Tundra Songstress!

"The Lucky Seven of Four Star Academy" is where if you collect every wish, something will come true! Yume and Laura, start looking for these wishes, but they can't find the seventh "Tundra Songstress" who is nowhere to be found. Meanwhile, Yuzu Nikaidō of S4 is at an event, and announces that her show is going to be replaced by another idol who is about to make a guest appearance.

全部集めるとねがいがかなう『四ツ星学園の七つのラッキー』！ゆめやローラたちは、ねがいをかなえようとさがし始めるのだが、七番目の『ツンドラの歌姫』がどうしても見つからない。そんな中、Ｓ４の二階堂ゆずのイベントに、とあるアイドルがゲストしゅつえんするという。