The time was the Warring States Period. Rantaro, who was born into a family of Hira ninjas, enrolled in a ninjutsu academy in response to his parents' desire to become a first-class ninja.　　There was Shinbei, the daughter of a wealthy merchant in Sakai, and Kirimaru, who lost his parents in Ikusa but lived strongly.　　The blame of the ninjutsu academy is called the ninja egg, "Ninja Tama". The ninjutsu academy is very lively, with a school principal who was a genius ninja, a unique teacher, senior students, a slightly formidable "kuichi classroom" girl, and a ninja dog hemhem!