Simon and Kamina live in an underground city monitored by the village chief. When Simon stumbles upon an artifact and beastmen invade from the surface, Simon and Kamina rebel against them.
Not streaming on a subscription service in the US right now.
Starring Tetsuya Kakihara, Katsuyuki Konishi, Marina Inoue, Yukari Fukui, Nobuyuki Hiyama, Mitsuki Saiga, Masaya Onosaka, Michiko Neya, Kiyoshi Kawakubo, Akio Suyama