Fireworks, Should We See It from the Side or the Bottom?(打ち上げ花火、下から見るか？横から見るか？)

One summer day a group of sixth-grade boys have an argument about whether fireworks are round or flat when viewed from different angles and embark on a journey for the answer during the annual firework festival. Meanwhile, one of their classmates, Nazuna, is troubled by her parents' separation and decides to choose one of the boys to run away with.