Gen Kudou, a skilled maker of the traditional Japanese string instrument called koto, doubts his rebellious grandson Chika's ability to appreciate its beauty. Seeking to honor his late grandfather's legacy, Chika endeavors to join the Tokise High School Koto Club. Despite the club's desperate need for new members, the club president, Takezou Kurata, hesitates to welcome Chika due to his troubled past. However, moved by Chika's determination and passion, Takezou ultimately grants him entry, alongside the talented koto player Satowa Houzuki and Chika's lively friends. Together, this eclectic group embarks on a musical journey, aiming to compete at the national level in Kono Oto Tomare!