Hori launched a crowdfunding campaign for the film to fund more equipment and staff for efficiency and quality. As of press time, the campaign has raised 13,663,200 yen (about US$94,000). There is no deadline. The project will proceed using the funds collected regardless of how much it earns.
Hori is in charge of all major duties in the movie, including directing, scriptwriting, character design, editing, music, storyboards, modeling, and voice acting.
Anime Limited released the original JUNK HEAD film, and it describes the story: In a dystopian future, humanity has attained longevity at the cost of its ability to reproduce. An artificial species was created to counteract the resulting dwindling workforce, until it revolted and formed its own subterranean society. When humanity is ravaged by a virus, a lone human is sent into the depths below to investigate the secrets of how this new species procreates, only to discover the monstrous ways they have evolved
The new theatrical cut for JUNK HEAD debuted in March 2021. Montreal's 25th Fantasia International Film Festival streamed the new cut in August 2021. This was the new edit's North American premiere. The film won the Cigogne d'or prize for animated film at the 2021 Strasbourg European Fantastic Film Festival.