Your favourite teddy bear. That model kit that took so long to complete. The picture book you used to read over and over again. The shining stone you found that day in the park. Where do all your childhood's treasures go when you grow up? In this story, we meet fantastic creatures that gather all these little objects that fall into oblivion as they are forgotten by their owners when they step into adulthood. These creatures sneak into our world from a different dimension, and unseen by humans, they take all the ditched and forgotten "treasures" into their world. Here, they use their booty to build their own city, a fairy tale-like place called... Oblivion Island!
| Directing | Shinsuke Sato | Director |
| Sound | Takashi Ui | Sound Director |
| Writing | Otsuichi | Screenplay |
| Writing | Shinsuke Sato | Screenplay |
| Directing | Naoyoshi Shiotani | Second Unit Director |
| Sound | Tadashi Ueda | Music |
| Visual Effects | Ren Ishimori | Character Designer |
| Art | Ren Ishimori | Prop Designer |
| Visual Effects | Ryo Hirata | Character Designer |
| Art | Masanobu Nomura | Art Direction |
| Visual Effects | Daiki Nakazawa | CGI Director |
| Visual Effects | Hirofumi Uchihori | CGI Director |
| Visual Effects | Hitoshi Uehara | CGI Director |
| Visual Effects | Kazuhiro Nishikawa | CGI Director |
| Crew | Masaki Taie | CGI Supervisor |
| Visual Effects | Nobumasa Hoshino | CGI Director |
| Visual Effects | Takashi Nagasaki | CGI Director |
| Production | Chihiro Kameyama | Executive Producer |
| Production | Mitsuhisa Ishikawa | Executive Producer |
| Production | Daisuke Sekiguchi | Producer |
| Production | Katsuji Morishita | Producer |
| Art | Michie Suzuki | Assistant Art Director |
| Art | Ryouka Kinoshita | Assistant Art Director |
| Production | Naoto Inaba | Assistant Production Coordinator |
| Art | Akihiro Hirasawa | Background Designer |
| Crew | Nobuhiro Morita | CG Supervisor |
| Editing | Tsuyoshi Imai | Editor |
| Visual Effects | Jun Satake | Effects Supervisor |
| Visual Effects | Atsushi Takeuchi | Mechanical Designer |
| Editing | Kazumi Wakimoto | Editor |
| Editing | Hitomi Kato | Editor |
| Art | Dwight Hwang | Storyboard Artist |
| Art | Naoyoshi Shiotani | Storyboard Artist |
| Sound | Christopher Moriana | Sound |
| Sound | Catherine Harper | Sound |
| Sound | James Moriana | Sound |
| Sound | Jeffrey Wilhoit | Sound |
| Sound | Nerses Gezalyan | Sound |
| Sound | Brett Voss | Sound |
