Honestly Riko is kind of annoying. If she wants to enter this lifestyle she has to accept what goes along with it.
The Kyoto Dialwct, calling others Onee-Chan ans the Ways Of talking are just to be expected
The fashion??? Holy shit i love these outfits?? They look appropriate for a so called evil family. Not like some other stories where "evil girls" wear dresses with ruffles, bows and Frills vomited all over them