It's A Deal Then? | Hazbin Hotel x Black Butler

This is the story of Audra Michaelis, she is Sebastian's older sister, an assassin, and nanny to Charlie Morningstar, the princess of Hell, who pursues her seemingly impossible goal of rehabilitating demons. Even though Audra thinks that no one is able to seek redemption, she still helps Charlie to pursue her dream.

When a powerful entity known as the "Radio Demon" reaches out to Charlie to help her and he falls in love with the princesses's nanny, Audra.

While Audra helps Charlie with running the hotel she also is in business with her best friend Blitzo.