In an elite academy where sports and magic combine, farm boy Key discovers his ultra-powerful natural talent and learns he may be destined to become the legendary . He joins the fierce goalkeeper Ssyelle to form a scrappy team of underdogs who take on the school champions. As Key struggles to control the raging dragon inside him and Ssyelle captains the team to a series of upset victories, they learn dark secrets of the past and uncover an ancient evil that threatens them all.