The episode begins with Nobita's mother preparing a fine meal in celebration of the twelfth anniversary of Nobita's father and hers wedding. At dinner, Nobita's mother and father have conflicting memories on who proposed first. They fight, and Doraemon takes Nobita back in time to find out just what happened. On the day of the proposal, they see Nobita's future father running late. To teach him a lesson, Nobita's future mother pretends to walk off, but decides to go back to him once it appears he has suffered long enough. It seems, however, that she has very poor eyesight and she picked another man who happens to be similarly built and dressed. Nobita's father stalks off. Once Nobita's mother puts on her eyeglasses and realizes she has the wrong man, she goes after him, but sees him embracing his sister and misinterprets this to be his quick recovery from their break-up. To rectify the situation, Doraemon uses a robot that transforms into each of their parents and tells the other the thing they remembered at dinner. They marry, but Nobita realizes they didn't solve the problem of who proposed first. Once returned to his own time, Nobita expects his parents to have divorced, but surprisingly, they have decided who proposed first doesn't matter and made up on their own.