Kids singing made-up birthday songs to each other is the entire universe of this short. There's no narrative trick, no emotional manipulation, just children creating something small and irreplaceable for one person on one day. The show understands that a song written by your classmates for you alone is worth more than any store-bought celebration. It costs nothing to make. It means everything to receive. That's the whole point.

Japanese schoolchildren sing cheerfully about birthdays in this single music video. Instead of the familiar Happy Birthday tune everyone knows, the songs are ones the kids came up with on their own, each made especially for whoever is celebrating that day. The result is a short, upbeat musical piece built around their homemade birthday songs.