Although inattentive and often zoned-out, Arisugawa Nino is very passionate about her singing.

Growing up, she and her childhood friend Momo would often sing with each other, usually to drown out the sounds of their parents arguing; however, right after the shock of Momo's disappearance, Nino stopped singing and began having the constant urge to shout instead. Unable to control herself, she began wearing a surgical mask. Later after meeting a boy named Yuzu, Nino was given new faith in her voice, and when Yuzu left, Nino began to hope that one day her singing would bring both Momo and Yuzu back.