蜜門 双葉

The twin younger sister of Hansel. Futaba is very intelligent, to the point she only needs to hear the teacher to score full marks on every test she ever made, without the need to take any note or study beyond homework. When she was small her twin brother(whose real name is never clearly stated) died because he had a poor health. However, despite anyone being able to explain how, her late bother became part of her cast power and she can summon him as a a puppet with conscience and free will to help her fight. 

She knows that "apparently there's something called love" but she never was interested and doesn't notice she is falling for the protagonist, which makes her suffer when other girls monopolize him and she doesn't even know why she is suffering.

Her power is string user. She can summon powerful strings to immobilize her enemies. She can also summon Hansel, a puppet, which originally was her brother's power. Her Hansel however is her late brother who has his memories, free will and personality, much to her dismay.

Her powers, along with her brother's are based on Hansel and Gretel fairy tale. Her cast power isn't a big deal, but she is so smart she can use it to rival even the strongest students in the academy.