Kosei Arima won numerous piano competitions while under the strict watch of his mother. He was known as the human metronome during that time. Since the death of his mother, Kosei Arima has been unable to hear the sound of his piano.
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If you want a formulaic Japanese love story thwarted by a love interest's sudden demise due to a serious illness, then this movie's for you. If not, you're out of luck. Never really pulled my heartstrings though (that might be my own fault considering that I have a heart that's as cold as ice at this point) but the music's nice.