Yaya tritt dem Yosakoi-Club nun offiziell bei, der nun vier Mitglieder hat. Ihre Vorbereitungen für das Supermarkt-Event schreiten voran, aber am entscheidenden Tag vergessen sie ihre CD. Sally-sensei sagt, sie wird "ihre Schwester fragen", die, wie sich herausstellt, die Schülerratsvorsitzende Machi ist. Die vier beginnen mit ihrer ersten Vorführung, aber...
Naru and Tami start exercising to try and lose weight in time for the event, though they soon learn the extra weight is because of stronger muscles. Meanwhile, Yaya uses her musical know-how to arrange Tami's composition, helping the girls focus on their choreography. On the day of the event, the group discover Sally had accidentally put the CD they need in her personal bag, so she sends her sister, who turns out to be Machi, to bring it to them in time for their performance. As the girls step up on stage to perform, with Machi invited to spectate, Naru starts to panic when the group starts falling off tempo and ends up messing up when she is reminded of a traumatic elementary school event.
ヤヤの正式加入で名実ともに4人揃ったよさこい部。デパートのイベントに向けて振付や音楽の準備が進むが、よりによってイベント当日、音楽が収録されたCDを忘れてきてしまう。「妹に頼む」と言うサリー先生が呼んだのはなんと生徒会長のマチだった。そして初めてのステージに臨む4人だったが…。
드디어 요사코이 부로서 처음으로 춤을 보여주는 백화점 이벤트 날이 왔다. 그런데 모두 기대와 긴장감에 마지막 점검을 하던 도중, CD를 놓고 왔다는 걸 깨닫게 되는데...
El Club de Yosakoi está listo para hacer su primera presentación, pero parece que un malentendido podría complicar las cosas. Además, el pasado de Naru esconde un secreto que se resiste a ser olvidado.
