Help me /music/!

Any information on this band would be much appreciated. Their official site is http://sigure.info/, but the "profile" page helpfully has the text as an image, so I can't google translate it.

I picked up their album '#4' the other week, and I love it, but I don't know anything about them. They sound like a 5-piece with two female singers; but the one picture I've been able to find of them (?) looks like a 3-piece guy band. What!

The name romanises as "rin toshite s(h)igure", and as far as I can tell it means something about "while it's raining".

It's a trap!

This is what I've found out so far:

• The main singer is male (with a Japanesely high voice, hah) and the backup singer is female.
• They are a three-piece. Must be some crazy mixing going on on the CD, because they sound much bigger. I wonder what they're like live...

Bumping in case any of those random Unpopular Popstars from Japan happen to know anything about this band.