Man you guys are depressing. As much as we would like to hope, with all the new releases that came AFTER Egao was released, it's unrealistic that it would stay within the top 10, let alone be number one. Japan's music market is evidently more fickle than the Western market, so there's bound to be more fluctuations in the rankings. And besides, the charts rank a total of what, 50 singles/songs at a time? More? Take a look at the BIG picture, and you'll see that while the song may not be rolling over everything left and right, it's not doing that badly and by NO means is it a sign that she's losing popularity.