To The Demon I Fall

Sage, as a chambermaid of an extinguishing hotel, somehow rescued someone's son that she later knew as a vampire.

In exchange for her generosity and kindness, she received an offer to work in a different place with different people to serve.

Less she knows, she agreed without a doubt and thought of having a better future.

The vampire warned her to wear a suitable costume as a disguise and never get it off no matter what happens.

At first, she thought they might have a costume party.

And she was given a task to become one of the delivery girls who deliver food and other goods to everyone's whim and later to the demon prince.