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The Dokutake ninja steal a shipment of saltpeter from Shinbei's papa. They plan to use it to create medicine that will make them fly and become super-ninjas! Danzou, who's father was transporting the goods, stows away and is taken to the Dokutake's secret headquarters. When Shinbei informs the school, Yamada-sensei and Doi-sensei rush to help. But Hagumi decide to take matters into their own hands and try to rescue Danzou themselves. Things don't go according to plan, though, and soon they all need to be rescued too. Fortunately Rikichi, Yamada-sensei's cool son, is around to help out! In fact,before long everyone gets into the act! But can Rantarou and his friends stop Happousai before it's too late?