They have made a total of 6 cast recordings, with each cast recordings having a specific color label. (Blue, Red, Light Blue, Green, Purple, and Orange)
Hehehe, something else to find and collect. Amazon has the red cast here
but it's absurdly expensive. Blue, Green, Orange, Purple here
, but also expensive. Seems there's also a number of other non-english versions too. I've have the french concept album, original broadway cast (1986), 1996, Original London Cast, and that's it... Granted, with about 22GB of broadway and off-broadway soundtracks... ^^;; I may be collecting too much, since I don't think I've listened to most of these...
I'm killing time here. Really must go back to studying for bio. Bad Neko, BAD!
 Step one: found the Japanese name. We think. レ・ミゼラブル