In the aftermath of the most devastating conflict mankind had ever experienced, the tiny island of Shikotan became part of the Sakhalin Oblast... and on the unhealed border in this remote corner of the world, friendship among children from two different countries timidly blossomed, striving to overcome language barriers and the waves of history. Inspired by true events.
| Directing | Mizuho Nishikubo | Director |
| Writing | Shigemichi Sugita | Screenplay |
| Writing | Taiki Sakurai | Screenplay |
| Editing | Junichi Uematsu | Editor |
| Art | Kosuke Hayashi | Art Direction |
| Art | Kunihiko Inaba | Art Direction |
| Production | Mitsuhisa Ishikawa | Executive Producer |
| Camera | Yumiko Nakata | Director of Photography |
| Visual Effects | Kumiko Yusa | Color Designer |
| Art | Santiago Montiel | Supervising Art Director |
| Visual Effects | Hisashi Eguchi | Key Animation |
| Visual Effects | Atsuko Inoue | Key Animation |
| Visual Effects | Hirofumi Masuda | Key Animation |
| Visual Effects | Kazuchika Kise | Key Animation |
| Visual Effects | Kouichi Arai | Key Animation |
| Visual Effects | Satoru Utsunomiya | Key Animation |
| Visual Effects | Tetsuya Nishio | Key Animation |
| Visual Effects | Toshiyuki Inoue | Key Animation |
| Visual Effects | Shinya Ohira | Key Animation |
| Visual Effects | Takashi Tomioka | Key Animation |
| Visual Effects | Yasunori Miyazawa | Key Animation |
| Visual Effects | Hisashi Mori | Key Animation |
| Visual Effects | Nobutake Ito | Key Animation |
| Visual Effects | Keiichi Kondo | Key Animation |
| Visual Effects | Hideki Ito | Key Animation |
| Visual Effects | Eiji Abiko | Key Animation |
| Visual Effects | Shinya Inoue | Key Animation |
| Visual Effects | Takahisa Katagiri | Key Animation |
| Visual Effects | Takahiro Tanaka | Key Animation |
| Visual Effects | Susumu Yamaguchi | Key Animation |
| Visual Effects | Yuuga Tokuno | Key Animation |
| Visual Effects | Yumi Kuroiwa | Key Animation |
| Visual Effects | Moe Usami | Key Animation |
| Visual Effects | Sara Moroyuki | Key Animation |
| Art | Eiko Matsushima | Painter |
| Visual Effects | Mirei Ogawa | Compositing Artist |
| Visual Effects | Miki Sakuma | Compositing Artist |
| Visual Effects | Fumio Furukawa | Compositing Artist |
| Visual Effects | Tetsuya Takahashi | Compositing Artist |
| Visual Effects | Sachiko Matsumoto | Compositing Artist |
| Visual Effects | Sakiko Murai | Compositing Artist |
| Visual Effects | Eiji Inomoto | CGI Director |
| Production | Taiki Sakurai | Producer |
| Production | Tomoyuki Miyagawa | Producer |
| Writing | Shigemichi Sugita | Story |
| Production | Francesco Prandoni | Associate Producer |
| Art | Mizuho Nishikubo | Storyboard Artist |
| Art | Nobutake Ito | Storyboard Artist |
| Art | Masaki Tachibana | Storyboard Artist |
| Art | Yoriyasu Kogawa | Storyboard Artist |
| Art | Eiji Abiko | Storyboard Artist |
| Visual Effects | Nobutake Ito | Character Designer |
| Visual Effects | Nobutake Ito | Animation Director |
| Art | Akane Iwakuma | Art Designer |
| Visual Effects | Kunihiko Sakurai | Key Animation |
| Visual Effects | Nobutoshi Ogura | Key Animation |
| Visual Effects | Yuki Kawashima | Key Animation |
| Visual Effects | Kazuyoshi Yaginuma | Key Animation |
| Visual Effects | Toyoaki Emura | Key Animation |
| Visual Effects | Katsumi Matsuda | Key Animation |
| Visual Effects | Kazuto Nakazawa | Key Animation |
| Visual Effects | Hisafumi Nakahara | Key Animation |
| Visual Effects | Izumi Seguchi | Key Animation |
| Visual Effects | Masayuki Honda | Key Animation |
| Visual Effects | Senbon Umishima | Key Animation |
| Visual Effects | Michiyo Suzuki | Key Animation |
| Visual Effects | Masatsugu Arakawa | Key Animation |
| Visual Effects | Takayuki Hamana | Key Animation |
| Visual Effects | Shunji Suzuki | Key Animation |
| Visual Effects | Mino Matsumoto | Key Animation |
| Visual Effects | Takashi Naoya | Key Animation |
| Visual Effects | Yoshiaki Kyougoku | Key Animation |
| Visual Effects | Takashi Mukouda | Key Animation |
| Crew | Akira Saitoh | Special Effects |
| Editing | Yoshinori Murakami | Assistant Editor |
| Editing | Taeko Hamauzu | Assistant Editor |
| Visual Effects | Akira Saitoh | Visual Effects |
| Visual Effects | Hisashi Ezura | Visual Effects |
| Editing | Hisashi Ezura | Color Grading |
| Editing | Akira Saitoh | Color Grading |
| Visual Effects | Makiko Yamazaki | 2D Artist |
| Directing | Masaki Tachibana | Director |
| Writing | David Wolman | Original Concept |
| Production | Tetsushi Suzuki | Production Assistant |
