Yuzu decides to hold a treasure hunt at the pool for her Shiny Smile brand's Premium Rare Dress premiere. The girls are put into pairs, with Yume paired up with Kirara, Rola with Mahiru, and Ako with Yozora, and are tasked with finding a genuine treasure chest among hundreds of fakes. Meanwhile, Elsa explains to Rei that she is planning to obtain the Sun Dress, a legendary dress that only appears once all nine Star Premium Rare Dresses are obtained. Following the hints given by Lily, Yume deduces that the real treasure chest is the large prop from the start of the hunt, inside of which they find Hime, Yozora, and Tsubasa, who are reforming a group with Yuzu for a limited time. In her dress debut performance, Yuzu obtains the sixth set of Star Wings, leaving just three remaining.