Kiteretsu Encyclopedia Opening
Video is of a fan reworking, not the original opening but it's very similar
The song is available on THE iDOLM@STER MASTER ARTIST 03 Hoshii Miki
Track 04. Suimin Fusoku
Catalog Number COCX-34389
http://www.gametrailers.com/remote_wrap.php?umid=118506.swf