“Kainé / Rain of Light” is a track off one of the Japan-only mini-OST albums you received by pre-ordering the game. To my understanding, there are relatively few of these out there (particularly the Gestalt version, since Gestalt was an X-Box only release and I think there are, like, three 360s in Japan). Rain of Light, of course, wound up being on the Gestalt mini-OST, so it’s almost impossible to find. I mean, without Google.
Fortunately, this video happened to use it as background music, and it is, to my knowledge, literally the only place you can listen to this track; every other place where it was one hosted has since had it taken down.
It’s quite beautiful (and I just remembered that it’s NIER music so that makes this statement ludicrously redundant), so it’s really a pity that it’s tucked away as it is. So please, enjoy! Keep circulating the tapes!