Kanou Shiori, a first-year Third High School student in 2095, possesses extraordinary spatial awareness and computational prowess. Once part of a disgraced Hundred Families lineage, her childhood was shadowed by familial strife and societal shame, culminating in her reclassification as an Extra. To escape her parents’ bitter clashes over their fallen status, she severed ties and joined the Kanou family, reclaiming her place among the elite. Beneath her analytical precision and unflappable exterior lies a battle with insecurity, a remnant of her past as a “numbers dropout.” Yet her strategic insight solidified her role as a trusted adviser in team competitions. Bonds with classmates Isshiki Airi and Tsukushiin Touko became pivotal to her evolution. Airi, spotting Shiori’s talent during the Libre Épée magic sport, secured her training at Kanazawa Magic Science Research Institute. There, Shiori mastered translating visual data into mathematical models, granting her unparalleled control over object trajectories. Her signature technique, Arithmetic Chain, lets her instantly decipher chaotic particle motions, empowering spells like Resonance Interference—shattering defenses via intersecting oscillation waves—and Friction Control, which alters resistance dynamics for tactical dominance. At the Nine Schools Competition, she excelled in Rookie Speed Shooter and Ice Pillars Break. A semifinal loss to Shizuku Kitayama, whose CAD upgrades outpaced her raw calculations, tested her resolve. Support from teammates reignited her drive to refine her skills. Shiori’s arc traces a tentative ascent from self-doubt to burgeoning confidence, fueled by camaraderie. Though echoes of her past linger, her adoption into the Kanou household and competitive triumphs mark steps toward forging an identity untethered from ancestral burdens.