Officially Bums and Boobs Day for PSP Gamers in Japan

This is getting silly, not only have the Japanese press been inundated with pics and video of AKB1/48, a girly photo game, but here comes Shirogane no Karu to Soukuu no Jouou, [many pics from Andriasang] - a conversion from a PC title with improved curves and stuff. 

This comes right after a host of IdolMaster content and 2Heart Dungeon from last week. Is there some sort of official cleavage day in Japan, and why can't we celebrate it too?