In March, at the age of 17, Nina drops out of high school and moves to Tokyo on her own. She's completely lost in the big city. She was encouraged to come here after hearing a certain song she found online. The day she arrives, Nina meets the street musician who plays that song.

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.

Tomo and Rupa join Nina, Subaru, and Momoka, making a five-member band. Momoka informs the rest of an upcoming show they could play, but the five members have such different personalities that it doesn't look like they'd ever come together. Nina and Momoka have different feelings about the band, and they begin the show while their relationship remains strained.

Tomo is scared to say how she feels due to traumatizing past experiences and is unable to truthfully express herself to the other band members. Nina is currently learning the guitar and asks Tomo for her assessment, and Tomo gives her harsh feedback. However, when Tomo sees that Nina isn't giving up, it gives her the confidence to change.

Nina's parents come to visit her from her hometown as she continues to dedicate herself to the band. Nina runs away, but she reluctantly returns to her home after everyone convinces her. She tries to talk to her father, but as always, he doesn't see things from her perspective. The next day, her father takes her to her old high school.