Shimako Toudou  

, 藤堂 志摩子

Shimako is a small but beautiful first-year student who is well-liked among her peers. She has a quiet and polite demeanor, but she possesses a strong resolve underneath. Despite this, she is considered the most gentle of the three girls in her class. In the first season, Shimako is referred to as Rosa Gigantea en bouton with Satou Sei being her older sister. Later on, in the second season, Shimako becomes Rosa Gigantea and Nijou Noriko is her younger sister.