[5] The story is set in a distant future world where humans have received longevity but lost their fertility, and are nearly extinct by population decline.
Not only the direction and scenario writing but almost all work, including voices, sculpting puppets, lighting, camera operating, editing, composing music, were, in the beginning, done by Hori alone.
[4] The story is set in a distant future world where humans have received longevity but lost their fertility, and are nearly extinct by population decline.
[5] As the story goes on, it becomes gradually clear that the underground world is a kind of dystopia where dangerous monsters roam or ambush,[3][5] and that the artificially created intelligent species developed a unique society.
[7] Siddhant Adlakha of Fantastic Festival 2021, Austin, Texas, mentioned that nightmarish creature designs in the film "evoke H.R.
[8] A page for the Festival Européen du Film Fantastique de Strasbourg 2021 guessed that the designs are inspired by not only Giger but also Jerome Bosch and M.C.
[7] A reviewer of Asian movies Kotzathanasis appreciated that the film was made to be virtually silent with the only words uttered actually being incoherent sounds.