A young boy, Masahiko Sakurai, grows up in Nagasaki where he sees the clear blue ocean every day. His mother wants him to be a violinist. To make her dream come true, Masahiko goes to Tokyo to learn the violin and stays with his aunt, Setsuko. One day Masahiko's mother visits him and he plays the violin for her and his aunt. The melody fascinates his two "mothers." It is not until later that he finds out what the two women felt for him.