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.
Kyoko Yoshine
Aya Chiyono (voice)
Takumi Kitamura
Mamoru Suzuhara (voice)
Haruka Michii
Saki Akutsu (voice)
Makoto Koichi
Malet (voice)
Megumi Han
Kaori Yamazaki (voice)
Rie Miyazawa
Hitomi Nakayama (voice)
Takahiro Sakurai
Masahiko Honda (voice)
Takeo Otsuka
Hiroto Honjō (voice)
