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 |
| Visual Effects | Hirofumi Uchihori | CGI Director |
| Visual Effects | Hitoshi Uehara | CGI Director |
| Visual Effects | Atsushi Takeuchi | Mechanical Designer |
| Sound | Takashi Ui | Sound Director |
| Production | Katsuji Morishita | Producer |
| Crew | Nobuhiro Morita | CG Supervisor |
| Writing | Otsuichi | Screenplay |
| Art | Ren Ishimori | Prop Designer |
| Art | Ryouka Kinoshita | Assistant Art Director |
| Sound | Tadashi Ueda | Music |
| Editing | Tsuyoshi Imai | Editor |
| Visual Effects | Kazuhiro Nishikawa | CGI Director |
| Visual Effects | Ren Ishimori | Character Designer |
| Production | Naoto Inaba | Assistant Production Coordinator |
| Visual Effects | Jun Satake | Effects Supervisor |
| Writing | Shinsuke Sato | Screenplay |
| Visual Effects | Nobumasa Hoshino | CGI Director |
| Visual Effects | Takashi Nagasaki | CGI Director |
| Art | Akihiro Hirasawa | Background Designer |
| Visual Effects | Ryo Hirata | Character Designer |
| Visual Effects | Daiki Nakazawa | CGI Director |
| Art | Masanobu Nomura | Art Direction |
| Crew | Masaki Taie | CGI Supervisor |
| Production | Chihiro Kameyama | Executive Producer |
| Production | Mitsuhisa Ishikawa | Executive Producer |
| Production | Daisuke Sekiguchi | Producer |
| Directing | Naoyoshi Shiotani | Second Unit Director |
| Art | Michie Suzuki | Assistant Art Director |
| 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 |
