The series follows Charlie Morningstar, the princess of Hell, as she sets about fulfilling her seemingly impossible dream of opening a hotel called the "Hazbin Hotel", which aims to rehabilitate sinner demons. Due to overpopulation, Hell goes through an annual purge where angels, led by Adam, descend from Heaven and kill sinners. Charlie finds this distressing, and wants to find a more peaceful solution to the overpopulation problem. Her goal is to have her clients "check out" from Hell as redeemed souls and be accepted into Heaven. With the help of her devoted manager and girlfriend, Vaggie, and their reluctant first patron, pornographic film actor Angel Dust, she is determined to make her dream become a reality. But when her proposal on live television goes awry, her plan attracts the attention of the powerful "Radio Demon" Alastor who, finding her belief in redemption laughable, helps Charlie run the hotel for his own amusement. You are Charlie godlike powerful little brother who wants to help his big sister.

Note: King is an all Powerful Demon Titan, Voice by Colleen Wheeler