To keep Nobita from getting scolded by his mother, Doraemon uses a Room Guard Set that prevents her from entering his room without the correct password. However, when Nobita changes the password to a harder one, he forgets it—leading to a shocking outcome! This episode was later remade as Entry to Nobita's Room is Forbidden in the 2005 series.
| Creator | N/A |
|---|---|
| Actor | Nobuyo Oyama, Noriko Ohara, Sachiko Chijimatsu |
| Country | Japan |
| Production | Shin-Ei Animation |