Yaya officially joins the Yosakoi Club, making for four members. They make progress on their preparations for the department store event, but they forget to bring their CD. Sally-sensei says she'll "ask her sister", who, as it turns out, is student council president Machi. The four approach their first performance, but…
That's right. Machi-chan is 
Sally-sensei's sister-chan.
ذلك صحيح، (ماتشي)-تشان هي شقيقة (سالي)-سينسي
Ja, Machi-chan ist
Sally-sensei Schwesterchen.
Así es, Machi-chan es la 
hermanita de la maestra Sally.
Así es, Machi-chan es la hermanita 
pequeña de la maestra Sally.
Oui, Machi
est la sœurette de Sally.
Sim, Machi-chan é a irmã-chan da Sally-sensei.