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.

Nina starts to cram for school. She promised her parents she would try to get into college. However, she's having a hard time adjusting to her new cram school life, finding it difficult to get into her studies. As she's struggling, she receives a text from Momoka. When Nina visits Momoka's house, she is introduced to a girl her age.

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.

In the battle of the bands against Diamond Dust, Nina's band's ticket sales have not even reached half of their sales projection. Meanwhile, Diamond Dust sold out their tickets. The harsh reality comes crashing down. Even then, Nina and the band stay true themselves and begin to play their song.