Toudou Shimako

Japanese name:

藤堂 志摩子

Prim, proper and very beautiful, Shimako is the most admired of the first-years. She is the petite soeur of Satō Sei at the beginning of the story and later her successor. Underneath Shimako's quiet, mannerly exterior lies a surprisingly strong resolve. However, Shimako is perhaps the most gentle of the three girls of her year in the Yamayurikai. (Source: Wikipedia)

In the first season, Shimako is Rosa Gigantea en bouton, her grande soeur being Satou Sei.

In the second season, Shimako becomes Rosa Gigantea, her petite soeur being Nijou Noriko.

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