After her mother passed away, a young girl named Pepe disguises herself as a boy in order to work. Keeping her mother's pendant with her, she travels to a secluded mansion to work as a servant. While working she stumbles across a secret passage leading her to a prison. Behind the prison bars is a man in a pig mask who calls himself Jack.

A girl follows the tradition of her family by testing to be a demon cleaner. During her test a vampire escapes and bites her. In order to reverse the effects of the bite her older brother and said vampire have to go on a demon cleaning job together.
(Source: Hello Scans)