Nobita sees Gian getting Suneo and two other boys to laugh at the open lot. Gian gets Nobita to read a funny manga his younger sister, 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 learned about what happened and takes the manga away. Gian is concerned as he watches Jaiko brainstorming new ideas of the manga plot throughout the night.
Gian assembles Nobita and the others the next day, and threatens them that he will beat them up if they do not laugh at Jaiko's manga when it comes out. Meanwhile, 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. Meanwhile, just as Jaiko is unable to think about ideas for the manga story, Gian encourages her, who finally gets an inspiration.
Suneo is trying to forcefully laugh as well at the open lot. He finds the belly button Nobita is wearing and uses it for himself. Doraemon renders the gadget useless and throws the console away. Nobita tags Doraemon along to read Jaiko's new manga. He is selected to read it, and cries uncontrollably. Gian gives Nobita a pat on the shoulder for his performance reading the sad manga, surprising everyone. Suneo comes by to read Jaiko's manga and is in for a shock. However, he begins to laugh at the inappropriate moment. Gian is enraged at Suneo for making Jaiko upset and beats him up.
- Takeshi Gouda
- Suneo Honekawa
- Two of Gian's classmates
- Nobi Nobita
- Jaiko Gouda
- Shizuka Minamoto
- This episode is a remake of the 1979 episode entitled The Magic Belly.
- This episode is the first appearance of Jaiko, the younger sister of Gian.