Fruits Basket Drama CD: "Sorta Cinderella" (Released by Hakusensha 2005) 

Released as part of the HCD Drama Series, this is the first story on their Fruits Basket CD. The seiyuu cast is the same as in the anime (which are listed below). The story follows closely with the "Sorta Cinderella" play storyline found in volume 15 of the manga. It's pretty easy to read along there, although some things are different.
Cast:
Aya Hisakawa as Yuki Sohma
Tomokazu Seki as Kyo Sohma
Yui Horie as Tohru Honda
Reiko Yasuhara as Saki Hanajima
Ryotaro Okiayu as Shigure Sohma
Yuka Imai as Arisa Uotani
Kenichi Suzumura as Kakeru Manabe
Jun Fukuyama as Naohito Sakuragi
Kaori Shimizu as Motoko Minagawa
Harumi Asai as Minami Kinoshita