Verfolgt (2015)

The female Protagonist starts her day like everyday: She stands up, goes for a run and takes a shower. But then she realizes a dark person standing behind her, but only when she looks into a mirror - when she turned around, nobody is there. This happens many times during the day and the person seems to be closer every time. She calls a friend and meets her at her friends house, but when the protagonist tells her friend the story and wants to show her in a mirror, nobody is there. The protagonist is happy and on her way back home, thinking the horror is over. But when she comes home and goes into her bathroom: The horror starts again.