From Fate:

Entirely unknown nationwide is a high school student named Shino Ryuuji. At a national convention in his last year of junior high, he was allowed to go to a U-16 training camp as a Japanese representative candidate; that was to show a single part. In a friendly match against the U-17 Spain representative, Ryuuji was selected as one of the chosen to bathe in the severe baptism of the world! In the overwhelming reality, many soccer fans were fascinated by Japan's first-of-its-kind genuine story, the long-awaited serialization!