During the school’s cultural festival season, Tsubame appears to be gradually gaining student support. However, in the middle of preparations, her entire class suddenly boycotts the event. Although the Platinum 8, including Mimorin, initially seemed cooperative, they seem to be behind the disruption. As Tsubame panics, Kei points out that she may have been the one distancing herself from others, prompting her to take action.
｢腑抜け共が蠢くクラスをヒックリ返せ!｣文化祭のシーズン。ツバメ(広瀬すず)は着実に生徒の支持を集めていた…かのように見えたが、文化祭の準備中に、突如全員からボイコットを食らってしまう。最初は協力的に見えたみもりん(杉咲花)らプラチナ8がまたも何かおかしな動きをしたようで…。慌てるツバメだが、彗(神木隆之介)が｢ハブられたんじゃない。おまえがやつらをハブってるんだ!｣と言われ、動き始める…。
