Hell Walker, Unchained Predator, Marked Beast. Those are the names if the most dangerous man in the history of Hell itself. The man who had faced the demons and walked away with barely any damage. The monster, for he is the only one they fear, The Doom Slayer. With his righteousness and audacity to combat against hell itself, he is their Eternal Doom!

Y/N is a regular 18-year old boy who goes to engineering school, hangs out with friends, and has a Hellhound named Loona for a girlfriend. Life is pretty good for him and Loona, until an unexpected visitor enters his life and changes everything. Having to multi-task with dating Loona and interacting with this stranger, he soon finds out a shocking moment that jeopardizes everything. And things only get worse from there... could he and Loona handle this much trouble? Well get to reading and you'll find out. NOTICE: This is a sequel to my first Helluvaboss fan fiction: Loona (Helluvaboss) X Male! Reader. I highly recommend checking that story out first before reading this one. Thank you and enjoy.