Arashi no J-Boy Buttobi Fighter

Kazami Touto, a soccer boy, is a fifth grader at Hamada Elementary School. Although he loves soccer, he was a fighter who didn't belong to the soccer club, but decided to join the soccer club after a practice match with Rendaiji FC, a powerful soccer team led by Takayanagi. Although he fought hard, he lost the practice match. The fighter tries to apply for a rematch with Rendaiji, but hears that Takayanagi has quit Rendaiji. Touji is shocked, but hears that the Hama Elementary School soccer club's Hitori Sasaki and others have been taken away by a mysterious foreigner.

What is the identity of the alien, and what will happen to Toujin's teammates and rivals?