Mizuki Shibata, a Course 2 student at First High School—colloquially dubbed "Weeds" by her peers—harbors a rare genetic mutation known as Photon Eyes. This trait enables her to directly perceive magical energy wavelengths, though the resulting light sensitivity necessitates custom-made protective glasses. Her unique vision uncovers subtle magical phenomena imperceptible to others, such as cloaked enchantments or hidden magical infrastructure.

Initially introverted and self-conscious about her condition, Mizuki gradually cultivates confidence through interactions with a tight-knit group of friends. These relationships emphasize collaborative resilience, whether navigating academic pressures or confronting magical dangers.

During a pivotal cinematic conflict, her Photon Eyes draw predatory attention from outside factions seeking to exploit her gift. Forced to confront her self-doubt, Mizuki redefines her ability, transitioning from viewing it as a vulnerability to wielding it as a strategic asset. Her heightened perception proves indispensable in thwarting antagonistic schemes, allowing her to expose and dismantle concealed threats.

Official media omits extensive exploration of her familial or pre-academy history, focusing instead on her arc of embracing her capabilities and cultivating decisive action during crises.