A compact bonus disc that opens with the short version of the Missing-X-Link vocal theme and then hands you eight untitled BGM cuts. What you're getting here is the mood-setting material, the atmospheric stuff that sits underneath scenes without calling attention to itself.
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It's a brief listen, more sampler than full score. The BGM tracks tend toward that soft visual novel register, hovering between emotional tension and quiet calm. Nothing overstays its welcome. Works best as companion material to the full OST rather than a standalone experience, since the complete soundtrack has thirty-plus properly named tracks.
If you're already invested in Missing-X-Link and want every last piece of audio from this game, this fills in the gaps.