The soundtrack by Hirofumi Murasaki, Morihiko Akiyama, and Masayuki Nagao will be released on vinyl by Data Discs. It was revealed in an article from The Guardian and later confirmed by the label itself. It available on oxblood and bone split vinyl, oxblood vinyl, and black vinyl. It was released on on October 2, 2015.
This is the black vinyl version.
Please note – Data Discs plan on doing continuous repressings of the black and oxblood variants and therefore I won’t mark these as sold out (unless it’s decided that no more pressings will be done). If the store page says sold out for the version you want then I would recommend waiting or contacting Data Discs about info on the next repress.