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The series focuses on Charlie Morningstar, the Princess of Hell, and her goal to open a hotel to help rehabilitate Sinners, with the aim of teaching them to be better people, have them redeemed and able to enter Heaven.

Hell suffers from severe overpopulation and heavenly powers solve this problem by annually exterminating sinners.

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.