Hazbin Hotel is the story of Charlie, the princess of Hell, as she pursues her seemingly impossible goal of rehabilitating demons to peacefully reduce overpopulation in her kingdom. She opens a hotel in hopes that patients will be "checking out" into Heaven. While most of Hell mocks her goal, her devoted partner Vaggie, and their first test subject, adult film-star Angel Dust, stick by her side. When a powerful entity known as the "Radio Demon" reaches out to Charlie to assist in her endeavors, her crazy dream is given a chance to become a reality.
Follow Blitzo (the 'o' is silent) as he attempts to run a startup killing company in a very competitive market, along with his weapons specialist Moxxie, his powerhouse Millie, and his receptionist hellhound Loona. With the help of an ancient book obtained by one of the princes of Hell, they manage to make their work possible and together they attempt to survive each other while trying to keep their business afloat.