論

Ginjiro advises Seikichi to travel alone with Sora to test out more fireworks, but also to settle their differences. There they meet Tetsuju the Human Fuse, who views Sora as Princess Moonbeam, much to Seikichi's chagrin. The myth behind Princess Moonbeam is explained. Tetsuju believes that he will construct a firework cannon better and sooner than Seikichi. After stumbling upon Tetsuju's cabin of firework cannons, Seikichi realizes how determined he must be to build a firework cannon, all when Tetsuju launches his own into the sky.

隠しごとをしていたソラに腹を立てた清吉は、未だその怒りを収めきれずにいた。そんな清吉とソラを仲直りさせようと、銀次郎は花火の試し打ちを名目に、二人で温泉に行くことを勧める。結局、銀次郎の計らいによって、温泉の湧く山奥へ向かった清吉とソラ。その山の中で、花火の試し打ちを始めようとした清吉は…。