Kataigou

Kei's younger sister. Knowing Kei's personality, she can convince/order her to do basically anything she wants. Reichen and her sister used to run a butchery when the late emperor saw and fell in love at first sight for Reichen, and she wasted no time to take the opportunity.

She likes to use her looks to seduce men to work for her but rarely even lets them touch her. She doesn't really care much about money or social status, but she hates the countryside and wants to live in capital/big cities even if she has to work in a butchery again to do so.

Spoiler

After Kazuto repeatedly resists her advances she becomes really interested in him and actually falls for him.