I'm searching for an anime which was released between 2013 and 2014. I am not so sure, but it seemed to be a new anime.
The plot of this anime is about a girl who has always been bullied at school. One day, when she goes to the schools toilet, she see a message on the WC door. The message comes from a boy/man/person who "is a god" (he calls himself a god). In the message, he tells the girl that he can stop the bullying and make her life better. All he wants from her is that she believes/trusts him like a god (because gods need trust/belief from humans to exist).