Sekai no Hate

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...

(Source: KakerA Translations)