Mizuki Shibata attends First High School, starting as a Course 2 student before transferring to Magic Engineering in her second year. She presents a timid demeanor and consistently wears eyeglasses, an unusual choice in her era due to common vision correction procedures. These glasses feature Aura Cut Coating Lenses, functionally mitigating her over-sensitivity to Psion energy and spirit particle emissions—a classified disorder causing discomfort and pain without them. Physically, she possesses a curvaceous figure with notably large breasts, brown shoulder-length hair, and yellow eyes. Her personality blends shyness with unexpected assertiveness, demonstrated when she confronted Course 1 students pressuring Miyuki Shiba on their first day, nearly escalating magically. She exhibits innocence in social interactions, often misinterpreting playful banter between Tatsuya and Miyuki Shiba as genuine romantic exchanges. Romantic tension exists between Mizuki and Yoshida Mikihiko, featuring mutual but unspoken affection. Mikihiko acknowledges special feelings for her, while Mizuki displays visible embarrassment during their interactions. One incident involved Mikihiko accidentally touching her breast while preventing a fall, causing extreme flustered reactions from both. Chiba Erika, Mizuki's first friend at First High, frequently teases them about this dynamic; their friendship persists despite Erika's tendency to embarrass her. Mizuki possesses an innate ability Mikihiko terms Crystal Eyes. This spiritual sight grants exceptional clarity in perceiving Pushion energy, spiritual auras, and spirits' true nature, including distinguishing spirit colors—a capability surpassing experienced summoners like Mikihiko who detect vibrations through magical recognition. Kokonoe Yakumo noted her sight's potential to uncover hidden secrets, such as Tatsuya Shiba's concealed capabilities, though she lacks the magical expertise to interpret such complex auras fully. Tatsuya remains wary of her potential to inadvertently reveal his secrets but acknowledges her value. Initial distress over her lack of control gradually shifts towards strategic application. Key developments across story arcs highlight her abilities: During the Nine Schools Competition, she removed her glasses to observe spiritual disturbances, identifying a spirit's interference in the Mirage Bat event. In the Yokohama Disturbance Arc, she detected hidden enemy forces like Lu Ganghu's bestial aura and Chen Xiangshan using Ghost Walker, enabling Miyuki's capture of the latter. Her Crystal Eyes proved instrumental in the Visitor Arc's Paranormal Parasite incident; she sensed entities possessing students, providing targeting data for Tatsuya, and analyzed the connection between a parasite inhabiting the android Pixie and Honoka Mitsui's emotions, describing it as the parasite copying or being imprinted by Honoka's feelings rather than a direct link. Academically, Mizuki initially pursued magic studies to control her eyes, later developing motivation to become a Magic Engineer influenced by Tatsuya's example. Her family background includes a mother working as a translator. Learning of the Shiba siblings' Yotsuba Clan connection caused Mizuki brief fear around them, though she gradually returned to previous friendly interactions. Her relationships extend beyond Mikihiko and Erika. She immediately recognized the sibling bond between Tatsuya and Miyuki Shiba despite their dissimilar appearances, raising Tatsuya's caution. She holds Tatsuya in high regard, often fantasizing about his relationship with Miyuki and openly supporting Miyuki's feelings. Nervousness around Tatsuya followed the Yotsuba revelation, eventually resuming comfortable interactions. Her character development centers on growing confidence in applying her unique abilities to support friends and contribute tactically, evolving from someone troubled by her power to a valued asset in spiritual detection and analysis.