They've chosen one of the busiest weeks of the year to release this (GREAT) single.
Exactly, the Idolm@ster Cinderella girls spammed the charts with 5 singles above her. It should sell just as well as Hatsukoi. Funnily enough, the same thing happened to Hatsukoi (two singles by Glay in one week, three singles by TV Anime Kuroko no Basuke above her).
Unfortunately, weekly she'll probably drop behind Mizuki Nana/T.M. Revolution and Kat-tun, so top ten is out of the question. Hopefully all those idolm@ster and other singles fall and she'll climb.