In the movie, 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…