From the article, "It isn't uncommon for one or two big titles to be released on the same day or within a few days of each other, (Example: Grand Theft Auto IV and Mario Kart Wii.) but more often than not, publishers will avoid this and scatter dates so their games will get the attention they deserve. Apparently the Japanese DS game publishers wanted to cause a free-for-all June 26, 2008, because five highly anticipated games are being released at once. Six, if you're excited about Simple DS Series Vol. 39 The Shouboutai (Fire Fighters).
So let's go over Bleach: The 3rd Phantom, Bokura no Telebi Game Kentei, Daigasso! Band Brothers DX, Jigsaw World and Disgaea DS, the five major titles being released in Japan."