Probably just my goldfish memory, I have no recollection of this song from the movie, however, I do remember it playing in the Uta filler episode and love it. I'm happy it got an entry on MAL so I can justify dropping a phat score on it.
Something about this song fills me with sadness and regret about a childhood I never had, it makes me feel nostalgic and homesick somehow, it connects me to Uta in a way I never knew I found relatable.
I love how the visuals show the innocence of the young, and also the despair of loneliness and the lack of a meaningful link.