Shizuno is a buxom girl who came from an affluent family and is seen kissing Moroha after the opening ceremony. Not only is she also his classmate, she is often lethargic, where she always seen sleeping in class or in any isolated place around the campus. Shizuno is a Kuroma, a magician who manipulates mana powers by turning in to spells or incantations through writing, which suggests that despite of being lethargic she's actually very intelligent. When fighting Metaphysicals, her attire transforms into a black long dress and she holds a staff that she uses to channel her powers. She and Moroha used to be in a relationship in another past life, which is why she is very attached to Moroha as much as Satsuki that the two treat each other as rivals. Unlike Satsuki, she is calm, levelheaded and very analytical, however she also very straightforward where she has no hesitation speaking her mind.

She is also a member of Strikers who are a group of high-ranking students that fight Metaphysicals, where she serves as a reserve.

It is revealed in episode 4 that, in her previous life, she was Moroha's (Shu Shaura's) wife.
She is the Witch of the Netherworld.
It is revealed in episode 12 that it is not a title but her name in the past life. When she was a child, she was a slave with no name, Shu Saura (One of Moroha Haimura's past lives) gives her the name Witch of the Netherworld for he was the King of the Netherworld.