So this is a bonus drama CD that came bundled with the Tokyo Necro Original Soundtrack Set from Nitroplus. It's basically a comedic side story set in the frozen dystopian world of Tokyo Necro, with the cast goofing off at a hot spring resort.
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Voice acting carries the whole thing since there's no real musical score to speak of. Just one track of the characters riffing in this absurd vacation scenario while the main game is all post-apocalyptic survival horror.
The contrast is honestly kind of perfect. If you've played through Tokyo Necro and got attached to the cast, this is a fun little bonus that lets them breathe outside the main plot.