Hell suffers from severe overpopulation and heavenly powers solve this problem by annually exterminating sinners. Princess Charlie, who has grown up in Hell, wishes to find an alternate solution to the mass slaughter, so she opens the Happy Hotel, utilizing an old family property, with her sister, Princess Clary, by her side.
There is substantial resistance to the concept by Hell's population however, as well as doubt that the concept is even possible; to solve this, Charlie, her sister, and her friends must work together to keep the hotel running and prove everyone wrong.
Charlie and the Princess of Hell, younger sister of John, Prince of Hell, when Charlie decides to open a hotel to rehabilitate sinners, John is called upon to help her. Amidst much confusion and trouble, the Morningstar siblings will explore and venture into every corner of hell.