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Yukiko Minase (水無瀬 由起子)First presented to be his stepsister, she is actually Minase’s live-in cousin and guardian, though the two act like siblings. She’s a strong-willed person, and enjoys bullying Minase, as well as teasing him at home with flashy outfits. Having learned Latin and French in grade school, she helps Minase translate the contents of the book.
(Source: Wikipedia, edited)