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.
芳根京子
as Aya Chiyono (voice)
北村匠海
as Mamoru Suzuhara (voice)
道井悠
as Saki Akutsu (voice)
小市眞琴
as Malet (voice)
潘めぐみ
as Kaori Yamazaki (voice)
宮沢りえ
as Hitomi Nakayama (voice)
櫻井孝宏
as Masahiko Honda (voice)
大塚剛央
as Hiroto Honjō (voice)
鈴木達央
as Sōma Ogata (voice)
宮本充
as Yamazaki - Kaori's Father (voice)
中尾隆聖
as High-level Politician (voice)
関智一
as Immigration Administrator (voice)
