After his brother Suguru becomes the ace player of the school's soccer (association football) team, Kakeru starts to doubt his abilities believing that he is useless and becomes the team's manager. However, despite becoming the team's manager he has continued to train every night alone. That is until the appearance of their childhood friend Nana appears and Suguru suddenly forces Kakeru to become a player on the team. However, despite Kakeru's raw talents he continues to lack heart preventing him from becoming the "knight in the area" that his brother believes he will become. However, Kakeru's life will quickly change before he's able to realize his true potential.