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.