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A Virtual Liver of Nijisanji. She is a teacher with a peculiar personality and is very free-spirited. She is often paired with Yuzuki Roa.
Usually mature and composed (if a bit perverted), Mirei's most glaring weakness is the existence of Kanda Shouichi - when with him, she almost always turns into a bashful, easily embarrassed version of herself that gets constantly teased by him.