Sora decides to stay until Seikichi builds the firework cannon, with Ginjiro being a killjoy. Sora quickly leaves after a lovesick Shunpei and a watchdog Onui causes more dismay for Seikichi. Ginjiro finds Oise, who faults him for having her fake an abacus dance for the upcoming river festival. Ginjiro later witnesses the white beast being attacked by a group of unknown armored men. Seikichi, after seeing Sora using strontium carbonate powder to enhance the coloring of a firework during a demonstration, is finally convinced in helping her build the firework cannon.
月まで届く打ち上げ花火の制作というあまりにも非常識な依頼にからかわれていると思った清吉は、ソラを冷たくあしらってしまう。一方、銀次郎は清吉を助けるために自分がついた嘘のせいで赤井から疑われたままだった。しつこく追求する赤井を通りでまくことに成功した彼は、黒衣衆に縛り付けられた白い獣を目撃して…。
