Hypersonic Music Club

In the world of tomorrow… when technology has reached it limits… a group of young cyborgs must battle the extra-dimensional monster girls for final control of the enigmatic force known only as… The Mystery Frequency! (Source: Crunchyroll)

In 2017, a short anime film called Hypersonic Music Club was produced in Japan. It was directed and written by Osamu Kobayashi, a veteran of the industry who passed away in April 2021. For various reasons, this short anime was never released. It was made public on August 1, 2023.