Reiko is Ryuuki's older sister, a genius who became one of Japan's top chemists at just 24 years old. She has raised Ryuuki in place of their parents, who passed away in an accident a decade ago. Having spent her youth solely on studying and parenting, she knows little about fashion or fun, giving off a somewhat unappealing vibe that doesn't attract male attention, though she seems unfazed by it. She serves as a mother figure to Ryuuki.
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