One track. Just one. Hayama Mizuki 0721 Voice CD from 2010 is a Windows character voice disc and it's literally a single entry called "0721, Mizuki Hayama." That's the whole thing. Pure character fan service for people deep into the visual novel scene.
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These single-track voice CDs were a specific product of late 2000s/early 2010s Windows VN culture. Bonus items, collector bait, usually bundled with limited editions or magazine features. Short, personal, and aimed directly at fans who already know and care about Mizuki.
Nothing sprawling here. Just a focused little artifact from a very specific corner of PC gaming culture. If you're into collecting VN ephemera, this is the kind of thing that exists.