Chika und ihre beiden Mitstreiterinnen Riko und You bekommen eine unerwartete Unterstützerin für ihr School Idol Projekt. Die drei finden einen Namen für ihre Gruppe und erleben ihren ersten Live-Auftritt.
Mari Ohara, a third year student and newly assigned as the director of Uranohoshi Girls' Academy, states that if the girls can fill up the school gym with audience members, she will approve their School Idol Club. Realising that there aren't enough students in their school to fill the gym, the girls are forced to search outside the school to advertise their concert. While trying to come up with a name for their group, the girls stumble upon the name "Aqours" anonymously written on the beach and decide to use it. On the day of the concert, only a handful of students show up, but the girls perform their hearts out nonetheless. Just as a power outage occurs and all hope seems lost, a whole crowd of people, who heard about the concert through Chika's sister and friends, arrive at the gym, while Dia secretly hooks up a backup generator, allowing the concert to continue.
作曲ができるメンバーも加入し、いよいよ本格的な活動に乗り出そうとする3人の前に、
学院の新理事長である小原鞠莉が襲来する。
3人を応援しに来たという鞠莉が提示した、人数が足りないスクールアイドル部を
部として承認する条件――それは、デビューライブで学院の講堂を満員にすること。
学院の生徒を全員集めても達成できない厳しい条件に、思いつく限りのあらゆる手段を
尽くして挑む3人。
がむしゃらに走り始めた3人のデビューライブの行方は果たして――。
우라노호시 여고의 3학년 학생이자 이사장인 마리는, 학교 체육관을 관객으로 가득 채우면 스쿨 아이돌 부를 정식으로 인정해주겠다는 제안을 한다. 첫 라이브가 시작되지만, 관객의 모습은 어디에도 보이지 않는데…
Mari faz uma proposta a Chika... Será que ela vai conseguir cumprir?!
Finalmente, Riko accede a ayudar a Chika y You en su sueño, pero antes de eso, necesitarán dar muchos pasos, entre los que destaca escoger un nombre para el grupo.
