Amazon Japan has started taking international pre-orders for the official Oninaki Original Soundtrack.
The Original Soundtrack comes with two discs. Each disc includes 25 tracks, so the original soundtrack contains 50 tracks. All Amazon Japan pre-orders come with a slipcase (image not available yet).
Here’s the cover art for the OST:
Pre-order here (ships worldwide). Oninaki Original Soundtrack launches September 11, 2019.