Rantaro, Kirimaru, and Shinbei are far from being excellent ninjas. Training at an elite ninjutsu academy in historical Japan, they are accompanied by their tongue-in-cheek friends, ninja masters, and idol senior ninja trainees. Rantaro and his ninja-in-training pals are called "nintama" — a combination of "ninja" and "tamago" ("egg"). The story of the film begins when Doi-sensei disappears after being challenged to a duel by Moroizumi Sonnamon, a tasogaredoki ninja. While Yamada-sensei and the 6th graders of the Ninjutsu Academy search for Doi-sensei, a man dressed in white suddenly appears at the Academy!
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(Source: Japanese Canadian Cultural Centre) 

Nintama Rantarou: Dokutake Ninja-tai Saikyоu no Gunshi