Scream Girls

According to an urban legend a girl named Hikiko Mori was taunted and bullied relentlessly by her classmates eventually resulting in her accidental death Holding a grudge against all bullies her spirit now haunts her former school slowly gathering the strength to exact vengeance on the living A group of frightened school girls decide to investigate the rumors further and what they find convinces them that they have to stop the spirit of Hikikosan before its too late