Manga L-Dk

From Which Scanlations: Shuusei Kugayama is the "prince" of his high school, but he always turns down confessions--including one from Aoi Nishimori's best friend. Although she initially hates him for this, when Shuusei moves in next door to Aoi, who lives alone, she starts thinking that he might not be such a bad guy after all...