I have read the first two volumes of this and I am loving it.

It is about a girl, Hikaru, who goes to prestigous all girls school as it was the same one her mother went to. All she wants more then anything is to be normal with no special attention and no one noticing her. This however is doomed to fail when it turns out that she has to share a room with an Idol, Izumi! After discovering Izumi's secret Hikaru's life will not be simple.