Mio is Kōichirō younger stepsister, not related by blood, but since their age difference is not by much, she is also a first-year student at Aikyō, and is in Kōichirō's class. She has a small build, is short, and has a quiet personality. She is a delicate person, and is known to be a crybaby. She loves her brother very much, and will often go to great lengths to please him. She is in the Drama Club at school.
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