That is Hijiri Asukai from the S・L・H Stray amor Hearts manga! :D I just started lectura it on manga here and I must say it is a must read!
On the eve of her sixteenth birthday, Kozue Hiyoki is visited in her dreams por a man who steals her heart- literally! Determined to find him and retrieve her stolen heart, Hiyoki enrolls in the S-Hall dormitories of St. Nazareth Academy, but quickly realizes that its residents are not at all like she expected... for starters, they are all guys. Link to a seguro site where tu can read the manga;
link If tu like that manga then tu will also like Barajou no Kiss, it's por the same autor the amazing Shouoto Aya!
Link to Barajou no kiss manga;
link