The Lady and her Apprentice

Charlotte finally lands an apprenticeship right after her graduation at an investigation department in the capital of Theoneian Empire. But it seems that her new mentor known as "Lady Kierra" is bad news. Full of mystery and and rumors of having a bad temper, is this Lady Kierra her gateway to become a full pledge detective or is she the one who will ruin all just like the meaning or her name, "The Dark Lord" ? And who is this young man who's always helping her but just gives her nothing but girl troubles?!