She's the maid. I think she's in charge of the Duke's household. Her brother works under the Duke himself as seen in the chapter before last.
No, I know she's a maid but who IS she?? She can defeat a S class monster by herself
Honestly, I would be more interested in reading a manga with her as a main character!
+1 (๑•ㅂ•)و✧
She's a S ranked adventurer
Who is Martha???!!!