This is a coming-of-age story about Sera Seo, a high school girl who struggles with a deep insecurity about her low voice. Ever since she was teased about it in middle school, Sera has found it hard to express herself and has trouble fitting in with her high school classmates. In her class is Takashi Narukami, a boy who also seems out of place among their peers. One day, Sera happens upon Takashi singing behind the school building during lunch. She is captivated by his voice and feels as though he belongs to a completely different world than hers. But from that moment, their connection begins to change both of their lives.