Mariya Kujou

Mariya Mikhailovna Kujou, nicknamed Masha, is a second-year student and student council secretary as well as Alisa's older sister. Her looks and gentle, motherly presence make her one of her year's two noted beauties and earn her the nickname "Madonna."

Masha deliberately acts airheaded around Alya because she loves her sister and does not want to compete with her, while her true personality is much more mature and serious. This contrast makes her difficult for Masachika to read.