Who is RayD?

[_____Cait]

You know, from Don't Be Afraid Myself.

I googled them, but can only find the IIDX song...

[津軽]

You know, I started asking myself the same question last night when playing that.

My guess is that they might be the three girls from the video/singer.

[_____Cait]

Yeah, that's pretty obvious, thanks for commenting though.

I don't think they've had any other IIDX songs besides Don't Be Afraid Myself.

[津軽]

Yeah.
They were probably just a one-time group thing. They probably don't even exist as a group now. Only they know for sure.
That's my guess.