Synopsis

To shield Nobita from his mother’s reprimands, Doraemon employs a Room Guard Set, a device that restricts entry to his room without the proper password. But when Nobita alters the security code to a more complex one, he promptly forgets it—a predicament that results in a startling turn of events. This particular story was later reimagined as "Entry to Nobita's Room is Forbidden" in the 2005 series.