Well, apparently I've managed to top this in the coincidence department. You see, two of my other favorite Japanese bands happen to be The Brilliant Green and Tommy February 6 (technically, the "6" should be superscript, but I'm lazy). They sound utterly different from each other (TBG is kind of alternative rock, and TF6 is total goofball bubblegum dancepop), but, um, they're sort of exactly the same. In that Tommy February 6 was what the singer (Kawase Tomoko) did when The Brilliant Green was (apparently) taking a long break. (The name comes from the fact that Tomoko's birthday was the 6th of February, 1974.) And I had no idea whatsoever, nor would I have ever guessed.
At this point, I wouldn't be surprised to find out they were produced by Andy Sturmer.