I own it. I like it a lot.
<a href="http://www.twin.ne.jp/~itohaji/daraku.htm" target="_blank">http://www.twin.ne.jp/~itohaji/daraku.htm</a>
use the top frame to navigate. the main page is the BBS, so don't get discouraged. Sometimes the posters will try to communicate with you, if you write in english, but it's pretty much Japanese only.
The team that made Daraku Tenshi also went on the work on KoF 99 and '00.
The game was never really finished though, it looks very good, but it's not finished. The team ran out of funds, one of the main programmers checked into a mental home, and they had to put it on the market no matter what. So it's missing 3 characters, the sound seems a little unrefined (like, way too midi for my tastes...). And then the kicker is that there's no way to play as the bosses. That's what really gripes me.
There are often bootleg kits for sale. I have the real kit from psikyo, it's good, and you should be able to find it for $200~$300.