One track. A bonus drama CD bundled with the limited edition of Hakuoki Reimeiroku on PS2. "Ryunosuke no Kimodameshi" (Ryunosuke's Test of Courage) is a spoken drama performance featuring the game's voice cast in a lighter, more comedic scenario than the main game's serious Shinsengumi drama.
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Not a music soundtrack in the traditional sense, this is pure fan service voice actor content. The Hakuoki franchise was peak otome game culture in 2010, and limited edition drama CDs were how developers rewarded their most dedicated fans.
If you're a Hakuoki collector, this exists. One track, one bonus scene, one limited edition memory.