Kanade is the executive director and founder of Miyagami Academy, president of the Gokujou Seitokai, and the successor to the Jinguji conglomerate. When she was just a kid, she had a wish to go to school, and so Miyagami High School was built.

She takes a special interest in Rino and takes care of her, later found to be at the request of Rino's mother, a relative of hers. She is able to telepathically communicate with other people. Also of note is that Kanade is later revealed to be Mr. Poppit, Rino's penpal at the beginning of the series. After her graduation from high school, Kanade returns in the last episode as the director of the school.
(Source: Wikipedia)