Kei Shirogane

Kei Shirogane serves as the student council treasurer at her middle school, where she applies her family's strict principles of frugality to every coupon and discount she finds. As Miyuki’s younger sister, she shares his deep sense of justice but is currently navigating a rebellious streak driven by resentment toward his overprotective nature. While her outward demeanor consists mostly of sharp retorts or polite formalities, she secretly longs for a way to communicate with Miyuki as an individual rather than just his sibling.