A twisted love story of wanton revenge and murder when a teen, accidentally killed by the Mother Superior at his Catholic school, returns from the dead to seek revenge.

Why would the teen come back for revenge if he was killed by accident?

How is this a love story? Either describe that or drop it from the beginning of the logline. Is the beginning of the film the protagonist returning from the dead? If so, you've provided us the set up but we don't know what happens next. He seeks revenge; what does that look like?

So it's told from the prospective of the ghost/zombie. I think that's an interesting twist.