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.
It's Christmas Eve in Tokyo as Ichiro is moving into his new apartment one month ahead of schedule. As he is getting settled in, two strangers enter the apartment and are surprised to find him there. They begin complaining that he is upsetting their plans for a Christmas party to be thrown in the apartment that night before attempting to kick him out.
A dragon fish is stolen by Tetsu Tobiyama and biologist Thomas Earwing seeks its return. Poo is led to Natsuro after she worms her way into a top secret file at Delta headquarters for information.
