Yuuki Kanade♀

Kanade is Kohei's childhood friend, and is the older sister of Haruna. She is constantly in high spirits, and likes to do things at her own pace. She loves her younger sister so much, that she says that if she had been born a man from another family, she would have definitely married Haruna eventually. She often calls her sister "Hina". She is the resident adviser in the Academy dormitory.

[From Wikipedia.]