Yes, Kyokugen 2 refers to the second loop where dying enemies shoot you back and not a different game. And I emailed to the address in your profile page, did you receive it?
I have the photos of the Japanese original package and disks. They are in terrible state, I even scribbled on the package *_* but may suffice to be watched. I might delete these photos later.
3 Disks? my copy is 2 Disks only... oO
I personally did not find the Stage 6 music to be a "copy", I remember feeling "is this so similar?". A lot of elements in Kyokugen are homages, eg Minchotai bold fonts in Stage 8 are modeled after the Evangelion cutscenes but that doesn't make Gainax to be Kyokugen's original author 
To think of that the entire story is influenced from the Aum cult gas attack.
Figured I'd bump this thread with a link -- I was able to get my hands on a rip of the Kyokugen + Pleasure Hearts soundtrack CD, which contains every track from both games as well as 4 arranged tracks. As this CD is now out-of-print and unavailable (believe me, I've tried everything to get my hands on it!), I decided -- with permission from the person who sent me the rips -- to upload the whole thing to YouTube as 50 separate videos + a playlist.
I don't think I'm in violation of any rules on here by posting this, but if so, please let me know. And if anyone associated with M-KAI or Primitive Sound wants me to take these down, please let me know. I'm doing this largely for the sake of preservation, as this is too good a CD to be lost to the ages.
Anyway, enjoy! This is a really, really great soundtrack, and the four arranged tracks are fantastic.
And if anyone has a copy of this CD that they want to sell me, or trade for something, please let me know. 
https://www.youtube.com/playlist?list=PLYiErrIGASwRgRtSkYNqf...
-Tom
Good vid! I almost feel like playing Kyokugen and Pleasure Hearts 
Cute Miku must be feeling the same!
And I don't think anyone would claim copyright anymore. I heard Pleasure Hearts and the CD had issue with the distributor who claimed patent on them and M-kai ended up receiving none of the sales.
According to Aucfree the Yahoo auction sold listing site, the CD was sold twice past 1 year, so keep looking, Auction Alert is your friend :)