After Gian kicks everyone out of the football match, the boys resolve to ignore Gian and make him their enemy, but because they are weaker than Gian, they still let him do whatever he likes to them - Haruo and Yasuo are ordered to buy groceries for him, while Suneo is forced to push the blame on Nobita. Thinking he has been betrayed by the others, Nobita tells Doraemon about it. Furious, Doraemon takes out the Friendship Chocolate so anyone who takes the chocolate will think and behave like him.
Doraemon gets Nobita to share the chocolate with Suneo, Haruo and Yasuo, who all rebel against Gian. Nobita also shares the chocolate to more passers-by, including a high school couple and Gian's mother, and they all target Gian and chase after him. Nobita drops by Shizuka's house to tell her about the chocolate, but soon everyone who ate the chocolate (including Suneo, Haruo and Yasuo) drop by as well, disrupting his time with her.
Nobita leaves to seek help from Doraemon, causing the latter to be sought after by the consumers of the chocolate, who all want to seek help from him as well. They all fight with Doraemon after Nobita argues with him, but both manage to escape and return home. A lazy Nobita decides to take a nap before dinner. Soon it's dinner time, but Mom isn't preparing - because she, too, ate the chocolate and decides to take a nap.