Rising Vocals Momoka reserves Shin-Kawasaki to a live house gig and tasks each member to sell tickets. In the process of doing so, the live house manager requests Nina and Subaru to give a Diamond Dust concert ticket gifted to him by one of its members to Momoka, but the girls decide to watch the concert themselves knowing Momoka would not accept the ticket. At the concert, Nina recognizes the band's new vocalist, Hina, as a former friend who abandoned her during Nina's bullying, causing her to leave in anger. Nina and Momoka later come to a head with how they view Diamond Dust, with Momoka defending her former band...