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.
| Directing | Tsutomu Shibayama | Director |
| Crew | Fujiko F. Fujio | Creator |
| Art | Shôhei Kawamoto | Art Direction |
| Visual Effects | Michishiro Yamada | Animation Director |
| Camera | Hitoshi Kaneko | Director of Photography |
| Camera | Nobuo Koyama | Director of Photography |
| Sound | Kaneta Kimotsuki | Theme Song Performance |
| Sound | Kazuhiko Inoue | Theme Song Performance |
| Sound | Kazuko Sugiyama | Theme Song Performance |
| Crew | Masaki Tsuji | Script |
| Art | Michiyo Fujii | Background Designer |
| Visual Effects | Wakao Hiroshi | Color Designer |
| Production | Souichi Besshi | Producer |
| Production | Tetsuo Kanno | Producer |
| Crew | Michiaki Doi | Special Effects |
| Art | Osamu Kobayashi | Storyboard Artist |
| Art | Michishiro Yamada | Storyboard Artist |
| Art | Hideo Kawauchi | Storyboard Artist |
| Sound | Shunsuke Kikuchi | Original Music Composer |
| Directing | Osamu Inoue | Assistant Director |
