On the Japanese island of Amami, despite lacking parental guidance, Kaito and his girlfriend Kyoko try to find their place in the world. While Kaito suffers from the absence of his father, who moved to Tokyo after his birth, Kyoko must come to grips with her mother’s terminal illness.
Arima Kousei 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, Kousei has been unable to hear the sound of his piano. He then meets Miyazono Kaori through childhood friend Sawabe Tsubaki. Kaori plays the violin and has a free sprit. Since meeting her, Kousei is able to face the piano again. Meanwhile, Kaori holds a secret.
In a park on a rainy evening, a 19-year-old university student, Fumi, offers an umbrella to a soaking wet 10-year-old girl, Sarasa. Realizing her reluctance to go home, Fumi lets her stay in his place, where she spends the next two months in peace.
