Keep it a Secret from Maria-sama

Elegant yet complex, Sachiko is fiercely protective of Yumi, grappling with family issues and a strained relationship with her fiancé.

Itou Miki

Shy and timid Yumi Fukuzawa becomes Sachiko's petite sœur, blossoming into a confident young woman.

Ueda Kana

Adored first-year, Shimako is initially Satou's petite soeur, later succeeding her as Rosa Gigantea.

Noto Mamiko

Sachiko fan, Drama club member nicknamed "Mechanical Drill," initially strains Yumi and Sachiko's relationship, but later becomes Yumi's petite soeur.

Kugimiya Rie

Independent and tomboyish, Yoshino is Rei's petite soeur, cousin, and neighbor, yearning for independence despite her frail health.

Ikezawa Haruna

Tomboyish kendo practitioner Rei Hasekura is secretly gentle, loves shoujo manga and dotes on her sister Yoshino.

Itou Shizuka

Fiery but calm, Noriko Nijou, a Buddhist art enthusiast, mistakenly attends Lillian Academy and becomes Shimako's petite sœur.

Shimizu Kaori

Tall Yumi Fukuzawa fan, a potential petite sœur, known as 'Denpa'.

Koshimizu Ami