This is music/drama for the Horror M series, some sort of horror comics for girls. I don't think this ever had any game spin-offs.
edit: Also
Office Rei and
Sora wa Akai Kawa no Hotori are drama cds for Mangas.
Also, what kind of game music does
The Legend of Mazinger contain?
edit2: Still waiting for a
Voicelugger game. Nope that's not going to happen.