It's a JP-only PS1 game with remastered music of the Sega Saturn counterparts.

Here's a comparison:
Saturn: https://www.youtube.com/watch?v=_A4Wo56-ei4
PS1: https://www.youtube.com/watch?v=Dl9cUTz2SYM

AFAIK, there is no official OST for this. I couldn't find a rip, so I spent hours trying to do it myself using VGMToolbox, but nothing I did seemed to work. So I'm requesting someone else to rip it, preferably in PSF format.

Thanks in advance.