Walkure Romanze ~Shoujo Kishi Monogatari~

Walkure Romanze's story revolves around Mizuno Takahiro, a student studying at an academy with jousting as its main focus for sport. Takahiro acts as an advisor to the riders of the sport. Takahiro goes through each day tediously until the time of the annual competition draws near. Due to some odd circumstances, his childhood friend Kisaki Mio is enrolled into the competition. She has never even ridden a horse before in her life, and Takahiro senses the fear in his friend and becomes Mio's coach.

From Wikipedia