Based on a very popular Japanese manga and anime "Nintama Rantarou", Set in the Muromachi period in early 16th century Japan, the young ninja Rantaro (Seishiro Kato) is born into a family of low-ranking ninjas. Rantaro is sent by his father and mother (Shido Nakamura and Rei Dan) to attend the six-year course at a Ninja Academy run by Denzo Yamada (Susumu Terajima). Rinatro's homeroom teacher is Hansuke Doi (Takahiro Miura) and head of the Ninja Girl classes at the school is Shina Yamamoto who appears as either a beautiful young woman (Anne Watanabe) or an older woman (Tamao Nakamura). After going home to his parents' farm for the holidays, Rantaro is joined by his schoolmate Shinbei (Futa Kimura) but they later decided to stay with teacher Doi. One day, some Usetake ninjas arrive at the house of flamboyant hairdresser Yukitaka Saito (Takeshi Kaga) and his son Takamura (Takuya Mizoguchi) in order to kill both of them. Yukitaka and Takamura used to belong to the Usetake clan, but Rantaro and his friends aim to save them by joining a contest that ends with a race to ring a bell on top of a mountain.