Mafuyu is the adopted daughter of St. Mihailov's last dean, and the self-appointed protector of Tomo Yamanobe. Upbeat and cheerful, she is so proficient in kendo that she carries a wooden sword with her all the time. She has to endure hardship on a daily basis in form of her classmates picking harshly on her and especially Tomo. This changes when she encounters Sasha for the first time, where she starts living with him and, little by little, is pitted herself in the fights between Qwasers. Though at odds with Sasha's coldness, Mafuyu has started to open up to him and the two have formed a stronger bond. She may have feelings of love for Sasha as seen in vol. 3 chap. 11 when she gets jealous. Sasha receives a letter from Yuu, in his locker, then meets with her, and invites her to stay at his room. Later when they both fall down into a cave and Sasha has no strength she gives him her Soma, though she does not admit to it. When asked what her business is with Sasha she responds with "because I wanna know". Also, later, in chapter 15, when fighting the "resurrected" Witch of Living Silver, when Sasha apologizes her for his weakness in battle, she contradicts him and tells him what he should say in those times, also telling that she wants him to use all of her energy and her life to fight, feeding him one more time, allowing Sasha to reach the 4th grade of elemental control. A running gag has Mafuyu hit heavily Tomo when the latter makes mistakes
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