Rich kids Hao Xiaowen (Hao Shaowen decorated) with halfway understanding "maid" ugly and has reached Shi Xiaobao, small jade-like stone into the Ninja school seek nothing but profits, the Ninja school open to laugh at the door, but he and small jade-like stone could only win the chance of admission. Four new students began in the Ninja teacher yuan (Ng Man Tat decoration) and two times under the guidance of learning technique. ". The naughty children in all aspects of life and learning do not forget to look for opportunities to learn practical joke, sword in hand, diving, eating into a laugh farce, tear gas has become their dark secret weapon to earn extra money, even the president (Huang Yifei) also defeated in his hands. One day, a man claiming to be a ninja uncle visiting Ninja school, he lost the Ninja games ten years ago and unable to get up after a fall, hard years only to find the enemy, while his opponent, he is a teacher, four small guy by uncle for help, how to deal with?