Ok, I finally found this again on YouTube (
here).
Now the challenge is to figure out the name of the song.
Here it is, but it's all in kanji:
Can anyone romanize the title and/or artist? All I can figure out is that it was released by Sony Records.
Yes, I'm trying to track down the CD single... I just recently snagged the single for the first ED (
here - although this isn't the cool version where you see 'em all dancing), so I feel somewhat inspired to try to get the ED2 single.