A girl waits for her mother. The song doesn't tell you this is sad until you feel it yourself. The music doesn't swell or manipulate, it just sits with her, and suddenly you're sitting there too, understanding loss through restraint instead of emotion spilled across the screen. One episode. That's all it needs.
A girl waits for her mother to come back from Tokyo, and the waiting leaves her sad. Told as a single music piece, it centers on that separation and on a child's longing for a parent who is away. There is no larger plot, just her sorrow set to music.