Rei Hasekura

Rei, Yoshino's grande soeur, appears very tomboyish and "bishounen" on the outside but is in fact quite gentle despite her appearances. Her favourite books are shoujo, her favourite word is "sincerity" and her hobby is sightseeing. She is involved in kendo, but obsessively cares about Yoshino and prefers the domestic arts, like cooking.

In the first season, Rei is Rosa Foetida en bouton, and her grande soeur was Torii Eriko. Her petite soeur is Shimazu Yoshino.

In the second season, Rei becomes Rosa Foetida.

(Source: Wikipedia)