When the Guild master of Ainz Ooal Gown is transported to the universe of Helluva Boss, he finds himself assisting a small Imp named Blitzo. The feeble Hellborn is rather grateful for the Undead's help, and swiftly offers him a job at his new business; the Immediate Murder Professionals! The Overlord is sceptical at first, but eventually agrees to work for Blitzo with minimum pay. Now, the Skeletal God must prevent his new comrades from getting themselves in more trouble than they can handle, whilst also balancing a new-found relationship with a Noble Woman from the Ars Goetia.