Miracle of Wings

From Esthétique:

Ayumu, after winning the Olympics Gold Medal in woman's competetive swimming, smashed her leg and retired. She transfered high schools, but makes little friends because of her unfriendly attitude. She meets Yoku, a diver on the school's diving team that all the girls fawn over. He teaches her to open her heart. But then Yoku finds out the truth about Ayumu and her doctor, Kasai-sensei...