A flashback shows Momoka and her Diamond Dust bandmates in high school discussing on dropping out to focus on their music career, with an idealistic Momoka assuring they will succeed and not give up.
With Rupa and Tomo's inclusion, the girls discuss on renaming the band from Shin-Kawasaki as Momoka is invited by one of her friends to perform at a live house in Suwa.
As Nina enrolls at a college out of a need to advance to university, Momoka brings up the proposition of forming a band upon seeing her skills as a vocalist from their street performance.