Mion must choose between Aira and Rizumu as her partner for the Summer Queen Cup. To decide, she goes on a date with Aira to the zoo for one day, and Prism Land with Rizumu for the next. Each date ends disastrously, but Mion learns that Aira wants to support Rizumu, while Rizumu wants to compete to perform "Aurora Rising." She has the two perform in front of her, and the girls perform "Stardust Shower Duo." Mion selects Aira as her partner, causing Rizumu to run out in shock.