The story takes place during the Warring States Period. Born into an ordinary ninja family, Rantaro Inameji entered a ninjutsu school to live up to his parents' high hopes and become an elite ninja. There he met Fukutomi Shinbebe, the son of a wealthy businessman, and Settsu Nokirimaru, who lost his parents in the war, and became friends with them, forming a trio. Each episode mainly tells the interesting stories of the three ninja eggs (little ninjas) in the ninja school. The TV series has been broadcast in mainland China, Taiwan, and Hong Kong. The purpose of the ninjutsu school is to train little ninjas. In the ninjutsu school, there are professors of different disciplines, teachers with different personalities, senior genius ninjas, female ninjas, ninja dogs Hemhem, and the eccentric principal Okawa Heiji Uzumasa, which is very lively! Rantaro's trio often fail in classes and exams, and always ask why, but they still persist and aspire to become first-class outstanding ninjas. The headmaster of the Ninja School is fickle and always makes strange decisions, which leads to many interesting stories. Rantaro and others are often involved in various events. The little ninjas are full of justice and try their best to solve any difficulties. "Ninja Rantaro" is a Japanese anime series adapted from the manga "Failed Ninja Rantaro" by Niko Saobei.