Set during Japan's turbulent Sengoku Period, this long-running children's series centers on three hapless student ninjas navigating the rigorous (and frequently humbling) curriculum of Ninjutsu Academy. With strict teachers, a rival class of kunoichi, and a roaming pirate crew causing chaos at every turn, the show balances historical flavor with gentle slapstick comedy. At just seven and a half minutes per episode across 29 seasons, it's an easy and charming entry point for younger visitors curious about ninja culture.