After witnessing a stunning drum performance by Masami Imamura, second-year high school student Asuka Hirayama instantly falls in love with him. As she gets to know Masami better, she soon discovers that he is the older brother of her close friend Taisen. However, when Asuka realizes that the impressive drummer has a hearing impairment, she is overwhelmed by indecision about whether to continue pursuing his affection. Even so, Asuka remains determined to follow the warmth blooming inside her. Kingyosou narrates a young girl's endeavor to resonate with a man who has closed his heart to many people. Despite the many obstacles and heartbreak that come her way, Asuka slowly gets closer to Masami—one step at a time.