Nintama Rantaro the Movie: Ninjutsu Academy - All Hands on Deck!

When the students of the Ninjutsu Academy return from summer break, they learn that Komatsuda accidentally mixed up all their summer homework assignments. Kisanta ended up with a sixth-year task-sneaking into Oomagatoki Castle to steal the lord’s fundoshi-and has since disappeared. Shinbei, Kirimaru, and others are sent to rescue him, but their mission won’t be easy since Oomagatoki is currently at war with Tasogaredoki Castle. Meanwhile, the academy receives a plea for aid from a village suffering from the war. Rantarou and the rest of the students and teachers set out to lend their support.