It's a soundtrack to an apocalyptic sci-fi film (never)filmed in Japan in 1984. Found in the production company's archives and finally published in this limited edition by HDK.
Slasher film score. music is reminiscent of the Italian horrors of the 70s-80s (Dario Argento, Lucio Fulci, Umberto Lenzi) and their experimental soundtracks (Ennio Morricone, Goblin, Bruno Nicolai).