Black Lagoon: Sawyer The Cleaner - Dismemberment! Gore Gore Girl summary:

Sawyer is a cleaner who takes on the task of disposing of unwanted people in Roanapur, a city of vice where the mafia and other scoundrels thrive. Her daily life is depicted in a funny, sometimes horror-filled, sometimes action-packed, and even fantastical way as she goes about her work with her beloved chainsaw in hand. Her good friends and fellow freelancers Shenhua and Lotton, as well as familiar characters from the main story, such as Revy and Rock, also make appearances!