Darkness (2018)

In this experimental horror film, the eponymous Darkness feels unsafe with Murder, the male part of her amorphous three way relationship. This feeling of dread is cemented when he kills her after she tries to leave him at a party. Darkness exacts her revenge when the DMT he forced her to take kicks in upon her death, catapulting her through a mirror world and turning her into an FBI agent with the necessary skills to dispose of him and to reconcile with her girlfriend Misery.