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, Takumi Kitamura, Haruka Michii, Makoto Koichi, Megumi Han, Rie Miyazawa, Takahiro Sakurai Added on HBO 2022-06-06. Youtube Trailer