Nobita sees Gian getting Suneo and two other boys to laugh at the open lot. Gian gets Nobita to read a funny manga Jaiko had drawn, and Nobita laughs as he finds the manga boring. Furious, Gian punches him. Gian later tells Jaiko that his friends find the manga funny, but Jaiko has already learned about what happened. He assembles Nobita and the others and threatens them that he will beat them up if they do not laugh at Jaiko's manga when it comes out. Back home, Doraemon finds Nobita forcefully trying to laugh, and lends him the Magic Belly that makes him laugh uncontrollably whenever the stomach plate is rubbed. Doraemon watches Nobita from above such that the gadget is not noticed.