Shiba Miyuki is a first year student in Course 1 of the First High School. She is the younger sister of Shiba Tatsuya and born in March. She is a bloom, which is considered the upper class. She is currently the freshmen representative, and is well known throughout the school.
Described as very beautiful and draws attention everywhere she goes. But she is still modest and kind. She has a warm and loving nature, and defends her brother anytime she can. She feels bad about being the "genius," while her brother is only a reserve magician as she thinks he is the real genius, Also, their father only cares about Miyuki, and ignores Tatsuya completely. Miyuki is very sad about that.
Miyuki uses half of her magic to limit Tatsuya's magic, as a side effect her magic goes out of control occasionally.
When Miyuki removes Tatsuya's limiter she can perform magic that she usually can't. One type of magic she can use can freeze peoples time which includes their nerves, muscles and consciousness.