Titre original : Mission Event
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.