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.

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.