Walkure Romanze

The story centers around Takahiro Mizuno, a student training to be a begleiter (knight's assistant) at an academy where aspiring knights joust. He himself had come to this academy to train as a knight, after becoming the unrivaled junior champion in his own home country. However, an injury in a tournament's finals forced him to withdraw. Instead, he decides to be a begleiter to one of the academy's maiden knights and help her win.

(Source: Anime News Network)