Where does the piano music of the son of weather appear?

A segment of a story in which two people finally meet. In the plot of the film "The Son of the Weather", piano music appears in the segment where the man and the woman meet, and the piano music that makes people think endlessly flows out of the silence. Son of the Weather is an original animated film directed by Makoto Shinkai and produced by ComixWaveFilms, which tells the fantasy love story between Van Gogh, a teenager, and Cai Yang, a girl who has the ability to manipulate the weather.