Narase Song (Cheng Hailiko) has shown extraordinary musical talent since childhood. After his father Koichiro Nishijima (Junxiu Nishima) disappeared, his mother Mei Xiang (Rimei Tezuka) put all her expectations on the song. As she grew older, the piano gradually became a burden on her shoulders. She had no friends and hobbies, and the relationship between the song and her mother, who was lost in pain and sadness, became more and more tense. By chance, Song met a boy named Heyin (Kenichi Matsuyama). Heyin was preparing for the conservatory of music, and the two who had a common language soon became friends. With the support and encouragement of the song, Harmony successfully passed the exam, but then became a student of Yuzichai (Mitian and Mei) because of the ups and downs of the piano. Yuzichai was once a good friend of Koichiro, and gradually learned the secret and fate of the song's family through her.
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