A live house that Momoka used to play at asked the girls if they wanted to play a show, and they agree to have their first battle of the bands. As they struggle to meet the ticket sale quota, Momoka gets tickets to a show for her former band.

The three girls practice to level up as a band. Nina is obsessed with beating Diamond Dust, and researches ways to increase their popularity, but she fails to find anything good. That's when Tomo and Rupa approach Nina after having been to see the three girls perform the other day.

Nina and the others arrive at an outdoor music festival. It's a huge venue, and the large stage gets them pumped. Diamond Dust takes the stage and they've gotten better since their last show. Nina and the band absolutely cannot lose. They're going to leave their mark. It's the start of their performance of a lifetime.