Kei Shirogane

Kei Shirogane is Miyuki Shirogane's younger sister, a Shuchiin middle school student, and treasurer of the middle school student council. Hardworking, proud, and strongly concerned with doing what is right, she willingly helps people in trouble. Her family's frugality has also made her careful with money, while Miyuki's overprotectiveness contributes to a prickly, rebellious attitude toward him.