Sekai no Hate

Sekai no Hate summary:

From KakerA Translations: Azusa used to be bullied to the point where she begged her parents to move. In her new school, she's asked out by the most popular guy, Kasuga-kun. Afraid of being bullied again, she agrees. But, she finds herself falling in love with Kawaguchi-kun and his strength. He gives her hope that she might finally break free from her past and find true love, but Kasuga-kun stares at her possessively with murderous eyes...