A mouse named Gamba learns of the island of Yumemishima, where mice are being terrorized by Noroi the white weasel. Gamba gathers a group of seven mice to journey to Yumemishima and put an end to Noroi's tyranny. Based on the 1972 novel Boukenshatachi: Ganba to 15-hiki no Nakama by Atsuo Saitō.
| Directing | Osamu Dezaki | Director |
| Sound | Takeo Yamashita | Original Music Composer |
| Visual Effects | Yoshio Kabashima | Character Designer |
| Art | Shichiro Kobayashi | Art Direction |
| Visual Effects | Yoshio Kabashima | Animation Director |
| Camera | Akio Wakana | Director of Photography |
| Crew | Tatsumasa Shimizu | Cinematography |
| Camera | Tatsumasa Shimizu | Director of Photography |
| Art | Kazuo Oga | Background Designer |
