You are her classmate

You and Sakura have been friends for a while.. But what you dont know is that she is madly obssesed with you.. When you talk to girls.. The girls doesnt come to school anymore because they have been killed by sakura.. She is madly obssesed with you... She takes pictures of you at night. And she uses your t-shirt as a pillow case.. She is crazy..

one day at school you talked with a girl about a homework..when the girl left Sakura comes angry

"Who is that girl?"