Sora wants Ginjiro to put the blue girl behind bars to prevent anymore murders of females in the streets. When Seikichi and Oise see Sora and Ginjiro at the riverbank, they assume that these two are dating. During a test launch, the nozzle of the rocket is able to maximize the thrust velocity, but the wooden barrel explodes due to the internal pressure of the nozzle. After Shunpei figures out that the barrel must be made of iron, it is learned that tickets will be sold in an underground lottery for the launch. As both Ginjiro and Akai find out who was responsible for distributing the tickets, the old man sends out a group of cats to gather the tickets to be burned. A clock tower bell is used for another test launch, but it starts ringing due to the internal pressure.
お伊勢からご馳走になった帰り道に清吉は、川岸でいい雰囲気で話し込んでいる銀次郎とソラを目撃してしまった。翌朝には銀次郎とソラのことが話題にのぼり、容赦の無い長屋の面々の会話が飛び交う。ソラとの接し方に戸惑い、花火の工夫どころではない清吉。そんな折、玉屋がらみのかげ富の情報を耳にした赤井は…。
