A film adaptation of a popular novel, which the loyal fanbase of "Nintama Rantarō" has long awaited. This is an action-packed, tear-jerker story, never-before-seen in the TV series!

At the Ninjutsu Academy, Doi teaches young ninjas known as "Nintama." One day, he goes out for a battle against a ninja from the rival clan, but vanishes without a trace. The Nintamas worry for Doi's safety, especially Kirimaru, a war orphan who lives with him. At the same time, the Academy receives troubling news that their rivals at Dokutake Castle may be scheming something. The older ninjas infiltrate the castle to investigate, but they are stopped by Tenki, whose face is identical to Doi.