Itazura - Ijiwaru Tenshi
Other titles :
悪戯 イジワル天使, Hold Me Again Tomorrow, Ijiwaru Tenshi, Listening with the Heart, Magic to Make you Beautiful, Tease - The Mean Angel, The Goddess Smiled!, The Mischievous Ill-natured Angel
Author(s) :Oota Saki
[From ShoujoMagic]: Ijiwaru Tenshi Ayumi is a high school student. Her friend's brother, Shouma, is younger than her, but he looks handsome and older! Shouma asks Ayumi for her digits right off the bat, and he's smooth like a player--not really Ayumi's type. The more time she spends with him, though, the more she likes him. But is Shouma really sent from heaven... or is he just a tease?