Sayaka Igarashi, Secretary of Hyakkaou Private Academy’s Student Council and devoted aide to its president, sports dark violet hair swept into a side ponytail secured by a white ribbon, with bangs angled left, and dons the standard uniform featuring a modestly elongated skirt. Her middle-school self hid behind black oval glasses and twin braids, embodying a bookish introvert until witnessing Kirari Momobami’s ascension to presidency through a gamble. Inspired yet intimidated, she sought the secretary role, prompting Kirari to reshape her image—shedding glasses, revamping her style—and igniting a fierce, loyal devotion to the president, whom she idolizes as her "one true love" despite loathing gambling itself. Tasked with overseeing debt collections and rule enforcement, Sayaka wields a tranquil exterior that belies a steely resolve, deploying a taser against unruly students. Perceiving Yumeko Jabami as a destabilizing force, she challenged her in the Tower of Doors, staking her identity as Kirari’s confidante. Defeat led to Kirari leaping after her in a symbolic reaffirmation of their bond, followed by her reinstatement under revised terms. Post-election turmoil saw Sayaka unravel after accidentally sabotaging Kirari’s prized aquarium system while assisting housepets, driving her into self-imposed isolation. She recalibrated by manipulating votes to secure Kirari’s power and orchestrating the Rock Paper Scissors Poker tournament, gradually aligning with the president’s capricious tactics over rigid logic. In spin-offs, she anchors chaos with pragmatism, tolerating Midari Ikishima’s antics while sporadically striving to curb her extremes. Kirari’s playful provocations about marriage or closeness with others expose Sayaka’s possessive streak, though her loyalty persists as the cornerstone of their dynamic—a partnership balancing Kirari’s whims against Sayaka’s methodical dedication, each embracing the other’s irreconcilable traits.