Jahresabschlussfest an der Uranohoshi-Mädchenschule.
Following requests from some of the students, Mari agrees to hold a "school closing festival" for Uranohoshi. However, preparations are set back after Shiitake sneaks into the school and causes damage, so everyone stays up late to get things ready for the next day. As the festival gets underway, Chika checks out the various attractions, which includes her classmates arranging a balloon display for everyone. At the end of the festival, Mari almosts breaks down in tears of regret, but is cheered up by cheers of support for Aquors.
浦の星女学院最後の新学期が始まった。よしみ、いつき、むつをはじめとした生徒たちからの、“最後にドカーンと盛り上がる閉校祭をやりたい”という提案に、感激しつつ快諾する鞠莉。明日に迫る本番に向け、この学校で過ごした日々に思いを馳せながら着々と準備を進めるAqours含む全校生徒たち。予期せぬトラブルが起こるも、理事長である鞠莉の全面的なサポートと生徒全員の頑張りでピンチを乗り越える。そしていよいよ浦の星女学院最後のお祭り、生徒全員の力で作り上げた“閉校祭”当日を迎える――。
학교 축제가 다가온 우라노호시 여고. 하지만 학교에서 마지막으로 열리는 축제인지라 폐교 축제라 칭한다. 그리고 열심히 축제를 준비하던 아쿠아는 귀신 소동에 휘말리게 되는데.
Com o fechamento da escola chegando, as alunas de Uranohoshi fazem um festival de encerramento da escola para mostrar seu amor e apreciação.
Cada vez queda menos tiempo a la escuela, así que en vez de celebrar un festival escolar cualquiera, todas las alumnas deciden organizar un festival de clausura.
