Elementary school students Jing'er, Nobita, Qiangfu and fat boy Ji'an are the four closest friends. They are called close friends because they often play together, but Qiangfu and fat boy Ji'an often bully Nobita. Nobita is born to be bullied. He is timid and introverted, and is often bullied by Qiangfu and Ji'an and runs home crying. However, there lives a robot cat from the future, Doraemon, at Nobita's home. Doraemon often sees Nobita being bullied and can't help but take out some "magic weapons" from the future world to help him. However, Nobita often abuses these "magic weapons" to play tricks on others, which often leads to an uncontrollable situation and a lot of jokes...