I wonder if it's one of those well done Asian hacks where the title screen is replaced (like KOF 10th anniversary etc.)
2001 copyright, the Korean (cat graphic) Kaneko logo, but an Asian region board? all a bit suspicious to be honest.
Maybe it's actually hacked from that Korean Gals Panic SU version of Gals Panic 4 that was missed some years back. (Still hope that shows up again because most Gals Panic SU boards are based on the other game)