Hazbin Hotel: A Dark Comedy Exploring Redemption in Hell

Charlie Morningstar's quest to save Hell's demons from Heaven's annual extermination forms the crux of the adult animated series.

Hazbin Hotel, an adult animated series on Amazon Prime Video, is centered around Charlie Morningstar's efforts to save the demons of Hell from an annual extermination event enacted by Heaven.
The series, which is not recommended for children under 18 due to its explicit content and themes, explores concepts of Heaven, Hell, damnation, and redemption.
Charlie, the daughter of Lucifer and Lilith, establishes the Hazbin Hotel as a rehabilitation center for demons, hoping to redeem them enough to ascend to Heaven and avoid extermination.
The annual Extermination is a purge-like event where angels descend to Hell to kill demons, a measure taken by Heaven to control Hell's growing population and power.
Heaven and Hell in the series are depicted as opposing realms, with Heaven being a place of light and Hell a realm of chaos and darkness, born out of Lucifer and Lilith's introduction of free will and evil into the world.