In the town of Saima, when summer is about to begin, a group of six high school students intend to live a secret adventure by spending seven carefree days in a ruined mining facility.
| Writing | Ichirou Ookouchi | Screenplay |
| Directing | Yuta Murano | Director |
| Editing | Takeshi Seyama | Editor |
| Writing | Osamu Sōda | Novel |
| Visual Effects | Hiroshi Shimizu | Character Designer |
| Sound | Jun Ichikawa | Original Music Composer |
| Visual Effects | Keishin | Character Designer |
| Camera | Toshiya Kimura | Director of Photography |
| Art | Daiki Kuribayashi | Art Direction |
| Visual Effects | Izumi Hirose | Color Designer |
| Sound | Sano Ibuki | Songs |
| Editing | Rie Matsubara | Editor |
| Production | Shuhei Arai | Producer |
| Production | Shinichiro Ozawa | Producer |
| Production | Takashi Tachizaki | Producer |
| Sound | Hiromi Kikuta | Sound Director |
| Visual Effects | Hiroshi Shimizu | Animation Director |
| Visual Effects | Yuki Nishioka | Animation Director |
| Art | Eiko Tsunado | Art Designer |
| Production | Jun Kawate | Executive Producer |
| Sound | Sano Ibuki | Theme Song Performance |
| Editing | Akane Shiraishi | Assistant Editor |
| Art | Kento Sasaki | Assistant Director of Photography |
| Crew | Miho Kawanishi | Special Effects |
| Visual Effects | Mao Kawaguchi | Key Animation |
| Visual Effects | Kumi Miyaguchi | Key Animation |
| Visual Effects | Hodaka Hashimoto | Key Animation |
| Visual Effects | Yui Okano | Key Animation |
| Visual Effects | Satoshi Shigeta | Animation Director |
| Visual Effects | satarisk | Animation Director |
| Visual Effects | Hiroshi Shimizu | Supervising Animation Director |
| Visual Effects | Yuki Nishioka | Supervising Animation Director |
| Visual Effects | Masayuki Sekine | Layout Supervisor |
| Art | Masaya Fujimori | Storyboard Artist |
| Art | Yuta Murano | Storyboard Artist |
| Production | Hiroyuki Fujita | Executive Producer |
| Visual Effects | Masaya Fujimori | Key Animation |
| Visual Effects | Hitoshi Kamata | Key Animation |
| Visual Effects | Yumi Chiba | Key Animation |
| Visual Effects | Lee Bo-ra | Key Animation |
| Visual Effects | Yuki Nishioka | Key Animation |
| Directing | Shinpei Matsuo | Second Unit Director |
| Art | Masayuki Sekine | Settings |
| Visual Effects | Masayuki Sekine | Key Animation |
| Visual Effects | Yuki Tamori | Key Animation |
| Visual Effects | Chihiro Saito | Key Animation |
| Visual Effects | Toshiya Washida | Key Animation |
| Visual Effects | Satoshi Shigeta | Key Animation |
| Visual Effects | Kentaro Azuma | Key Animation |
| Visual Effects | Keiko Shimizu | Key Animation |
| Visual Effects | Takashi Kawaguchi | Key Animation |
| Visual Effects | Nanako Ninomiya | Key Animation |
| Visual Effects | Naoko Yamamoto | Key Animation |
| Visual Effects | Maho Aoki | Key Animation |
| Visual Effects | Shigeki Iwasaki | Key Animation |
| Visual Effects | Mitsuyo Asano | Key Animation |
| Visual Effects | Takahiro Taiga | Key Animation |
| Visual Effects | Yurika Konuma | Key Animation |
| Visual Effects | Kasumi Sakai | Key Animation |
| Visual Effects | Yuki Uejo | Key Animation |
| Visual Effects | Tomotaka Nakayama | Key Animation |
| Visual Effects | Hatsumi Takahashi | Key Animation |
| Visual Effects | Shinya Nakamura | Key Animation |
| Visual Effects | Hiroyuki Horiuchi | Key Animation |
| Visual Effects | Risa Tanaka | Key Animation |
| Visual Effects | Naoto Abe | Key Animation |
| Visual Effects | Sayuki Nakamura | Key Animation |
| Visual Effects | Toshihiro Uranaka | Key Animation |
| Visual Effects | Hiroyuki Yoshii | Key Animation |
| Visual Effects | Shouji Endo | Key Animation |
| Visual Effects | Kazuko Shibata | Key Animation |
| Visual Effects | Misato Takasaki | Key Animation |
| Visual Effects | Nobuyuki Mitani | Key Animation |
| Visual Effects | Yoko Komaki | Key Animation |
| Visual Effects | Tetsuro Kaku | Key Animation |
| Visual Effects | Ayano Shimizu | Key Animation |
| Visual Effects | Etsuko Miura | Key Animation |
| Visual Effects | Kaori Yuma | Key Animation |
| Visual Effects | Fumiaki Asano | Key Animation |
| Visual Effects | Asami Ota | Key Animation |
| Visual Effects | Hanako Egami | Key Animation |
| Visual Effects | Satoshi Ohashi | Key Animation |
| Visual Effects | Takeshi Ichiki | Key Animation |
| Visual Effects | Yuuichi Nakajima | Key Animation |
| Visual Effects | Tsuyoshi Ichiki | Animation Director |
| Visual Effects | Tsuyoshi Ichiki | Key Animation |
