

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.
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Cast
- Kyoko YoshineAya Chiyono (voice)
- Takumi KitamuraMamoru Suzuhara (voice)
- Haruka MichiiSaki Akutsu (voice)
- Makoto KoichiMalet (voice)
- Megumi HanKaori Yamazaki (voice)
- Rie MiyazawaHitomi Nakayama (voice)
- Takahiro SakuraiMasahiko Honda (voice)
- Takeo OtsukaHiroto Honjō (voice)
- Tatsuhisa SuzukiSōma Ogata (voice)
- Mitsuru MiyamotoYamazaki - Kaori's Father (voice)
Crew
- Yuta MuranoDirector
- Ichiro OkouchiScreenplay
- Osamu SōdaNovel
- Toshiya KimuraDirector of Photography
- Jun IchikawaOriginal Music Composer
- Takeshi SeyamaEditor
- Rie MatsubaraEditor
- Takashi TachizakiProducer
- Shinichiro OzawaProducer
- Shuhei AraiProducer
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