The story tells the adventures of the boy, 21 emon, engaged in the management of a hotel belonging to his family for years. In his problems, 21 emons is helped by the robot Gonsuke and the little alien Monga.
| Actor | Role |
|---|---|
 Kazuhiko Inoue21 Emon (voice) | 21 Emon (voice) |
 Tadao FutamiPapa (voice) | Papa (voice) |
| YYoko KuriMama (voice) | Mama (voice) |
 Kaneta KimotsukiGonsuke (voice) | Gonsuke (voice) |
 Kazuko SugiyamaMonga (voice) | Monga (voice) |